U-532 - 1st War Patrol

Translation by Jerry Mason - special thanks to Aaron S. Hamilton for providing a legible copy of this KTB

Departed
Date
Arrived
Date
Days at Sea
Kiel
25 March 1943
Lorient
15 May 1943
52

 

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Ships Attacked
None
Note:  The positions in the table above and in the Google Earth patrol summary are derived from the KTB and in many cases do not match those set forth in authoritative references such as Jürgen Rohwer, Axis Submarine Successes of World War Two or the Uboat.net website.  The goal here is to present the picture relative to the U-boat and not the absolute position that the ship was attacked or sank.


 
                                                                                       
 
                                                                   
   
Kriegstagebuch "U-532" from 11.11.42 - 24.03.43.
 
           
    11.11.42 Hamburg Commissioning.  
    12.11.42 - 15.11.42       " Testing.  
    16.11.42 Brunsbüttelkoog Transit.  
    17.11.42 Kiel Kaiser Wilhelm Canal, transit to Kiel.  
    18.11.42 - 06.12.42    " U.A.K. testing.  
    07.12.42 Swinnenünde Central Baltic.  
    08.12.42 Stettin 25.Uflottille clearing of the boat.  
    09.12.42 Central Baltic Transit.  
    10.12.42 - 11.12.42 Danzig U.A.G. testing.  
    12.12.42 - 16.12.42 Gotenhafen T.E.K. testing.  
    17.12.42 - 23.12.42 Hela Agru-Front.  
    24.12.42 - 27.12.42 Danzig U-boat Base.  Leave.  
    28.12.42 - 31.12.42 Hela Agru-Front.  
    01.01.43 Gotenhafen T.E.K. (New Years).  
    02.01.43 - 06.01.43 Hela Agru Front.  
    07.01.43 Hela-Gotenhafen-Pillau Transit.  
    08.01.43 - 16.01.43 Pillau 26.Uflottille. Torpedo shooting.  
    17.01.43 - 18.01.43 Gotenhafen Tactical Flottille  
    19.01.43 - 21.01.43 Central Baltic Tactical training.  
    22.01.43 Stettin Dry docked to change propellers.  
    23.01.43 - 29.01.43 Central Baltic Tactical training.  
    30.01.43 Gotenhafen - Danzig Tactical Flottille final discussion U-boat Base Danzig.  
    31.01.43 - 06.02.43 Danzig 25.Uflottille Torpedo shooting.  
    07.02.43 Central Baltic To Bornholm.  
    08.02.43 Bornholm, Central and Western Baltic Sound trials and transit to Kiel.  
    09.02.43 - 10.02.43 Kiel Engine testing.  
    11.02.43 Hamburg Kaiser Wilhelm Canal, Elbe Detusche Werft.  
    12.02.43 - 13.02.43 Hamburg Meetings final adjustments and overhaul, outfitting the boat.  
    14.02.43 - 15.03.43 Hamburg Final adjustments and overhaul.  
    16.03.42 - 18.03.43       " Testing and outfitting.  
    19.03.43 Kiel Transit to Kiel.  
    20.03.43 - 24.03.43 Kiel Testing and preparing for the Front.  
    25.03.43 Put to sea on 1st war patrol.    
           
                                       
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Click the flag to view the above page from the original German KTB
 
                                                                                       
 
           
           
           
           
               
           
              
           
     
 
                              K r  i  e  g  s  t  a  g  e  b  u  c  h  .
 
                                               U  5  3  2  .
 
 
    Kommandant:    Korvettenkapitän Junker.
           
                    1st Patrol.  
           
           
          Beginning:   25.3.1943.  
        Concluding:  15.5.1943.  
           
           
           
           
                             Times D.G.Z.  
                             All naval squares  
                             Patrol under Operations Order 54.  
           
           
           
           
           
           
                              Distribution: 2 x O.K.M.  
        1 x B.d.U. Op.  
        1 x Kmdr.Adm.d.Uboote.  
        1 x F.d.U. -West-  
        1 x F.d.U.Ausb.  
        1 x 2.Uflottille.  
        1 x 27.Uflottille  
           
           
           
                          
           
           
 
- 1 -
 
           
           
           
           
    25.03.42 Kiel U-boat Base    
    08.00 NEbyN 2, Sea 0-1, misty, Vis. moderate Cast off for 1st war patrol.  
           
    11.00 AO 7498 Taken under escort by M 1902.  
           
    12.00 AO 7493 Day's run:  47 nm  
           
    16.00 AO 7199    
           
    19.52 AO 7241 Passed barrier in the Great Belt.  
           
    20.00 AO 7241    
           
    26.03.43 Great Belt, Kattegatt    
    00.00 AO 4573    
           
    04.00 AO 4815    
           
    07.20 AO 4492 Waited on new escort Vp. Boot 1611 and to carry out escort change.  
           
    08.00 ENE 2-3, Sea 2, overcast, Vis. good    
           
    11.48 AO 4461 Carried out escort change by Vp. Boot 1707.  
           
    12.00 AO 4461 Day's run:  231 nm  
         
    15.40 - 16.10 AN 3638 Carried out test dive.
           
    20.00 AN 3616    
           
    21.00 AN 3612 Released Vp. Boot 1707, further escort by harbor protection boat.  
           
    21.43 AN 3612 Made fast Kristiansand.  
        Fuel supply.  
           
    27.03.43      
    06.50 AN 3612 Cast off and continued under escort by U.J. 1207.  
           
    08.00 AN 3614    
      NNE 2, Sea 1-2, overcast, misty, Vis. 5 nm    
           
           
Sun and Moon Data 25.03.43
Sun and Moon Data 26.03.43
Sun and Moon Data 27.03.43
 
- 2 -
 
           
           
           
    continued      
    27.03.43      
    09.30 - 09.50 AN 3537 Carried out test dive.  
           
    12.00 AN 3521 Day's run: 157 nm  
           
    13.35 AN 3274 An enemy aircraft sighted bearing 280°T.  Range 3000-4000 meters.  Altitude 50-100 meters.  Flying direction SW.  
           
    16.00 AN 3164    
           
    17.15 AN 3137 An aircraft flying directly at the boat (altitude 100-200 meters).  Taken under fire at range 2000 meters.  Aircraft turned away, shot Recognition Signal , recognized as own Ju 88.  
           
    18.15 AN 3121 Released escort U.J. 1207.  Came to westerly course.  
           
    20.56 AN 4333 After 36 nm came to northerly course.  
           
    28.03.43 West coast of Norway    
    00.00 AN 2836    
           
    04.00 AN 2335    
           
    05.37 AF 8781 Dived to proceed submerged at depth 50 meters.  
           
    08.00 AF 8757    
           
    12.00 AF 8754 Day's run: 243 nm  
           
    16.00 AF 8727    
           
    19.54 AF 8724 Surfaced to continue transit on the surface.  
           
    20.00 W 2-3, Sea 2, medium Swell, overcast, Vis. good    
           
    29.03.43 West coast of Norway    
    00.00 AF 8454    
           
    04.00 AF 8175    
           
    06.41 AF 8141 Dived to proceed submerged at depth 40 meters.  
      WSW 2-3, Sea 2, medium Swell, overcast, Vis. changing    
           
           
Sun and Moon Data 27.03.43
Sun and Moon Data 28.03.43
Sun and Moon Data 29.03.43
 
- 3 -
 
           
           
           
    continued      
    29.03.43      
    08.00 AF 8117    
           
    12.00 AF 8114 Day's run: 128 nm  
           
    16.00 AF 8111    
           
    20.00 AF 5777    
           
    21.21 AF 5774 Surfaced to proceed on the surface.   
        Course change to 300°.  
           
    30.03.43 Norwegian Sea    
    00.00 AF 4967    
           
    04.00 AF 4673    
         
    06.42 AF 4569 Dived to proceed submerged at depth 50 meters.  
      W 2-3, Sea 2, medium Swell, overcast, few showers, Vis. moderate    
           
    08.00 AF 4565    
           
    12.00 AF 4564 Day's run: 127 nm  
           
    16.00 AF 4553    
           
    20.00 AF 4528    
           
    21.48 AF 4527 Surfaced to proceed on the surface.   
        Course change to 270°.  
           
    31.03.43 Norwegian Sea    
    00.00 AF 4439    
           
    04.00 AF 4419    
           
    05.00 AF 4417 Came to port to course 250°.  
           
    06.48 AE 6662 Dived to proceed submerged depth 50 meters.  
      W 3, Sea 2-3, medium Swell, overcast, Vis. changing, fog in places    
           
    08.00 AE 6661    
           
    12.00 AE 6653 Day's run: 126 nm  
           
Sun and Moon Data 29.03.43
Sun and Moon Data 30.03.43
Sun and Moon Data 31.03.43
 
- 4 -
 
           
           
           
    continued      
    31.03.43      
    16.00 AE 6655    
           
    20.00 AE 6646    
           
    22.01 AE 6649 Surfaced to proceed on the surface.  
           
    01.04.43 Iceland Strait    
    00.00 AE 6671    
           
    04.00 AE 6587    
           
    07.16 AE 6811 Boat dived to proceed submerged.  
      NW 4, Sea 3, medium Swell, overcast, rain in places, Vis. changing    
           
    08.00 AE 6811    
           
    12.00 AE 6733 Day's run: 104 nm  
           
    16.00 AE 6762    
           
    20.00 AE 6753    
           
    22.00 AE 6756 Surfaced to proceed on the surface.  
           
    02.04.43 Iceland Strait    
    00.00 AE 6745    
           
    04.00 AE 5978 "Rosengarten" abeam to port on course 260°.  
        Course change to 200°.  
    07.03 AE 8269 Dived to proceed submerged depth 50 meters.  
      SW 3, Sea 2, medium Swell, overcast, Vis. moderate    
           
    08.00 AE 8269    
           
    12.00 AE 8295 Day's run: 130 nm  
           
    16.00 AE 8298    
           
    20.00 AE 8531    
           
    22.40 AE 8534 Surfaced to proceed on the surface.   
        Course change to 240°.  
           
Sun and Moon Data 31.03.43
Sun and Moon Data 01.04.43
Sun and Moon Data 02.04.43
 
- 5 -
 
           
           
           
           
    03.04.43 North Atlantic    
    00.00 AE 8528    
           
    02.45   Incoming Radio Message 1247/2/175:  
        New objective for . . . . . . . . , Junker, . . . . . . . . . , is naval square AJ 99 . . . . . . . . "  
           
    04.00 AE 8469    
           
    07.44 AE 8488 Dived to proceed submerges at depth 50 meters.  
      SW 4, Sea 3, medium Swell, overcast, Vis. changing    
           
    08.00 AE 8488    
           
    12.00 AE 8721 Day's run: 117 nm  
           
    16.00 AE 8713    
           
    20.00 AE 8715    
           
    23.00 AE 8714 Surfaced to proceed on the surface.  
           
    04.04.43 North Atlantic    
    00.00 AE 8714    
           
    04.00 AE 7938 Outgoing Radio Message 0514:  
        Sent Short Signal weather report.  (On request in accordance with Incoming Radio Message 1904/3/102.)  
           
    07.46 AE 7961 Dived to proceed submerged at depth 50 meters.  
      WSW 4, Sea 3-4, medium Swell, overcast, Vis. good    
           
    08.00 AE 7961    
           
    12.00 AE 7956 Day's run: 57 nm  
           
    16.00 AE 7955    
           
    20.00 AE 7957    
           
    23.00 AE 7973 Surfaced to proceed on the surface.  
           
    05.04.43 North Atlantic    
    00.00 AE 7972    
           
    04.00 AE 7971    
           
Sun and Moon Data 03.04.43
Sun and Moon Data 04.04.43
Sun and Moon Data 05.04.43
 
- 6 -
 
           
           
           
    continued      
    05.04.43      
    05.07   Outgoing Radio Message 0507:  
        Sent Short Signal weather report.  (On request in accordance with Incoming Radio Message 2046/4/117.)  
           
        Though sent three times, was not heard immediately, probably due to bad transmitting conditions from large Sea State, repeated at 05.53 hours, 06.12 hours and 07.51 hours on Coastal, Africa and Ireland Circuits.  
        It is assumed that as a result bearings were taken on the boat from land, because an hour later 4 depth charges or aircraft bombs were heard at great range.  
           
    08.00 AE 7895 Dived to proceed submerged at depth 50 meters.  
      W 4-5, Sea 4, medium Swell, overcast, at times hail showers, Vis. changing Because the boat is still in an area especially endangered by air and the Sea State hinders the use of anti-aircraft weapons, like the previous days proceeded submerged until the beginning of dawn.  
           
    08.45 AE 7895 4 detonations from depth charges or aircraft bombs heard at great range (20 nm).  
           
    11.10 AE 7894 Medium strength propeller sounds heard in relative bearing 250°, which for the prevailing Sea State shifted ahead quickly.  At 330°R the sounds went back to 225°R and were gradually fainter, until they disappeared entirely after about 15 minutes.  
           
    12.00 AE 7894 Day's run: 61 nm  
           
    16.00 AE 7889    
           
    20.00 AL 2212  
           
    23.00 AL 2214 Surfaced to proceed on the surface.  
           
    06.04.43 North Atlantic    
    00.00 AL 2136    
           
           
           
Sun and Moon Data 05.04.43
Sun and Moon Data 06.04.43
 
- 7 -
 
           
           
           
    continued      
    06.04.43      
    05.17   Incoming Radio Message 1002/5/124:  
        Operational orders for Group Löwenherz".  
        (Switched to convoy circuit Hubertus.)  
        Initially operate on "Zitzewitz"-convoy, which was assumed to be heading for Reykjavik.  
      [apparently 210° is a typo, course of the Mumm-convoy was east] In accordance with Incoming Radio Message 2105/5/830 operated on "Mumm"-convoy.  General course 210°, 15 knots.  Assumption:  convoy goes to the North Channel.  
        Whether the "Zitzewitz" and "Mumm" convoys are one in the same remains open.  
           
    04.00 AL 2157    
           
    08.00 AL 1299    
      NWbyW 3-4, Sea 3, medium Swell, overcast, Vis. good In the course of the morning freshened strongly, wind shifted to the SSW and strengthened to 6-8, speed gradually decreased to 12 knots; plotted at 9-10 knots.  
           
    12.00 AL 1486 Day's run: 158 nm  
        Further Radio Messages corroborate assumptions for the "Mumm"-convoy. (Radio Messages from Lange, Otto, Karpf, Fiehn.)  
        Due to the absence of new contact keeper reports (the present ones all related to the time from midnight from 5 to 6 April), there was no exact picture of the movements of the convoy.  
        Therefore, continued to operate with appropriate maneuver ahead to the east, plotted with general course 100° and 9 knots.  
           
    16.00 AL 1657    
           
    17.28   In the course of the day took a navigation fix from three sun observations which gave a difference between dead reckoning and actual position of 60°T, 53 nm, because for the previous 3 days there has been no possibility of a navigation check.  
        Also by the new ship position - if the enemy holds course and speed until the beginning of darkness - will reach an intercept point in the night of 6-7 April at about 03.00 hours.  (Lead in enemy course direction 15 nm.)  
           
    20.00 AL 2574 The arranged bearing signals from "Wolfbauer" for 6 April at 19.00 hours were not heard in 4 Program times.  
    [Not understood - Wolfbauer (U-463) was at sea but not involved in the convoy battle.  Possibly Karpf (U-632) was meant.)  
           
           
           
Sun and Moon Data 06.04.43
 
- 8 -
 
           
           
           
    continued      
    06.04.43      
    23.00   Incoming Radio Message 2231/6/704:  
        Leadership accepts that the convoy on a course of about 100° will head for the North Chanel passing south of Rockall Bank.  If there is no contact in the course of the night maneuver ahead at highest speed, to be in position ahead of the convoy at dawn for day attacks.  
           
        No new decisions.  
           
    07.04.43 North Atlantic    
    00.00 AL 1839    
           
    02.15   Crew to action stations.  
        6 tubes ready, of these each 2 bow - one stern tube "MZ" and "AZ", because in the heavy swell operation of "MZ" is considered questionable.  
           
    03.20 AL 1894 Reached intercept point.  
           
    03.40 - 03.52 AL 1894 Dived for all around listening.  
        Band of sound bearings from 90°-140°T.
           
    04.00 AL 1894 Pursued in the direction of the sound bearing band on course 110° at 16 knots.  
      W 4, Sea 3, light Swell, Vis. medium  
           
    05.50 AL 2912 In good visibility no enemy seen.  
           
    05.58 - 06.15 AL 2912 New dive for all around listening.  Only still two weak sound bands each 10° wide in 60° and 160°T.  Continued to run on course 100° at 15 knots until dawn.  
           
    07.00   Radio Messages 0215 and 0403 from U-563 mention a broad sound band in naval square AL 1831 and AL 2577.  
        Either it is a partial convoy, by this running to the NE, or the "Karpf"-convoy has zigzagged.  
           
    07.33 AL 2922 Because operation on the sound observations by U-563 is hopeless by day in the air endangered area I decide to dive at daybreak in the hope that the "Karpf"-convoy is possibly still to the west and/or that scattered stragglers will pass nearby.  
           
           
Sun and Moon Data 06.04.43
Sun and Moon Data 07.04.43
 
- 9 -
 
           
           
           
    continued      
    07.04.43      
    07.33   Boat is on the suspected route for the convoy given by B.d.U.  
        It is too bad the good night attack conditions could not be exploited.  
        I attribute missing [the convoy] in part to navigation differences and to the absence of continual contact keeper reports on 6 April.  
        Since only remaining completely unseen ensures the prospect of success and, at the same time, the necessary assurance against surprises in the heavily air-and sea-monitored area, occasional periscope observations submerged back and forth throughout the day.  
           
    08.00 AL 2922    
           
    09.50 AL 2927 2 depth charges heard.  
           
    11.12 AL 2787 3 depth charges heard.  
           
    12.00 AL 2787 Day's run: 197 nm  
           
    14.38 AL 2788 2 depth charges heard.  
         
    15.33 AL 2787 2 depth charges heard.  
           
    16.00 AL 2787 1 depth charge heard.  (All depth charges at a range of 10-20 nm.)  
        Between 11.00 and 16.00 hours individual propeller sounds were distinguished repeatedly, suspected to be from U-boat hunters, as the frequent depth charge detonations showed.  Periscope observations showed nothing.  
           
    20.00 AL 2779    
           
    23.07 AL 2787 Surfaced.  
           
    08.04.43 North Atlantic    
    08.00 AL 2774    
           
    04.00 AL 1857    
           
    08.00 AL 1766    
      W 3, Sea 2, overcast, Vis. changing    
           
Sun and Moon Data 07.04.43
Sun and Moon Data 08.04.43
 
- 10 -
 
           
           
           
    continued      
    08.04.43      
    12.00 AL 1756 Day's run: 116 nm  
           
    12.13 AL 1756 Incoming Radio Message 1152/8/751:  
        Löwenherz Boats, do not head for the supplier or to home, head for naval square AK 85 at economical transit speed.  
           
        Course change to 200°.  
           
    13.26 AL 1755 Dived for four-engined aircraft (Boeing?).  Flying direction 90-100°, altitude 400 meters, range 3000 meters.  
        Due to low speed settings (diesel-electric switched) the boat got away from the surface badly.  At diving depth 20 meters at some distance one aircraft bomb.  
           
    16.00 AL 1757    
           
    20.00 AL 1787    
           
    09.04.43 North Atlantic    
    00.00 AL 1917    
           
    04.00 AK 0368    
           
    08.00 AK 0388    
      SSW 2, Sea 1-2, overcast, Vis. changing, fog in places    
           
    12.00 AK 6318 Day's run: 135 nm  
           
    12.32 AK 6318 Dived before an enemy aircraft.  Range about 4000 meters, altitude 500-500 meters, flying direction 70°.  No aircraft bombs.  
           
    16.00 AK 6286    
           
    20.00 AK 6287    
           
    23.00 AK 6515 Course change to 270°.  
           
    10.04.43 North Atlantic.    
    00.00 AK 6436    
           
    04.00 AK 6425    
           
    08.00 AK 5636    
      SSW 3, Sea 2, cloudy to clear, Vis. good    
           
Sun and Moon Data 08.04.43
Sun and Moon Data 09.04.43
Sun and Moon Data 10.04.43
 
- 11 -
 
           
           
           
    continued      
    10.04.43      
    12.00 AK 5625 Day's run: 166 nm  
           
    16.00 AK 5536 Incoming Radio Message 1428/10/775:  
        As group "Lerche" . . . . . . , Junker, . . . . . . . at increased transit speed occupy patrol line naval square AK 5486 to AK 8916.  Today at 24.00 hours switch to "Ireland" Circuit.  
    20.00 AK 5554    
           
    11.04.43 North Atlantic    
    00.00 AK 5735    
           
    00.25 AK 5738 Took position in patrol line, steamed back and forth slowly at transit speed.  
           
    04.00 AK 5761    
           
    08.00 AK 5738    
      NW 3-4, Sea 2-3, overcast, rain, Vis. changing    
           
    09.15 AK 5738 Incoming Short Signal:  
        Convoy naval square AK 8213.  
        After receiving the Short Signal steered an intercept course for the convoy at 15 knots.  
           
    12.00 AK 5827 Day's run: 198 nm  
           
    14.03   Dived to listen.  Sound band in 125° to 155°T.  
        Because there have been no further contact keeper reports since 10.00 hours, operated on sound band.  
           
    16.00 AK 5915    
           
    16.30 AK 5678 Meeting with U-191.  
        Navigation comparison and experience exchange.  
           
    17.40 AK 5689 Dived for all around listening.  Sound band now shifts further astern bearing 155° to 215°T.  
           
    19.30 AK 5933 By plotting the convoy should be in sight, still nothing seen.  Therefore dived for all around listening.  Sound band now bears 200° to 250°T.  
           
    20.00 AK 5933    
           
           
           
Sun and Moon Data 10.04.43
Sun and Moon Data 11.04.43
 
- 12 -
 
           
           
           
           
    11.04.43      
    20.15 AK 5933 Incoming Radio Message 1952/11/101:  
        Enemy located naval square AK 5862.  Course 80°, speed 8 knots.    Zitzewitz.  
           
    20.27   Incoming Radio Message 2016/11/102:  
      [typo AK5873] 20.00 hours convoy located naval square AK 5073, course 70°, speed 13 knots.    Winkler.  
        According to both contact keeper reports the boat is positioned ahead of the convoy.  So the convoy is to the west.  Continued to run on westerly courses.  
           
    22.40 AK 5928 Convoy in sight bearing 280°T.  Stands out well against bright western horizon.  
        It turns out to be 12 to 15 steamers proceeding in two irregular columns.  Relatively strongly protected by a minimum of 6 escort vessels.   
           
        Outgoing Radio Message 2240:  
        Have contact naval square AK 5916.  
           
        The weather had calmed noticeably. The night fell slowly, and attack conditions were relatively difficult due to the increasing moon.  
        Since the boat is positioned favorably for attack ahead to starboard I intended to start as soon as possible.  Convoy course at the moment is about 10°.  I already had the impression that the enemy zigzagged fairly frequently on courses between 0° and 90°.  
           
    12.04.43 North Atlantic    
    00.00 AK 5925    
           
    01.00 AK 5931 Around 01.00 hours suddenly, without any apparent reason being detected, about 20 star shells were shot to either side and ahead of the convoy.  I postponed the attack for a bit and ran ahead of the starboard forward escort of the convoy on a parallel course.  
      W 1, Sea 1, cloudy to clear, Vis. good  
           
    11.15 AK 5931 About 01.15 hours turned to run in on course 240°.  Boat is now positioned ahead inside the starboard escort.  Targets were a deeply loaded tanker, estimated 4500 GRT and a somewhat larger steamer, positioned a little behind.  Intention:  two 2-fans.  
           
           
Sun and Moon Data 11.04.43
Sun and Moon Data 12.04.43
 
- 13 -
 
           
           
           
    continued      
    12.04.43      
    01.15 AK 5931 If possible the stern 2-fan can be shot while turning away.  
        Estimated enemy values:  target speed = 7 knots, target angle = 60°, range = 2000 meters and 2500 meters.  
           
    01.25 AK 5931 Despite the favorable position both fans miss because the enemy turned to starboard about 80° shortly after the shot, observed by the Torpedo Officer immediately after the second fan went.  For this reason also the stern-fan was not shot.  
        Due to a regrettable double operating error by the heretofore quite good and reliable TWL-Petty Officer, who for both fans switched to the next fan before the second shot went, only one shot went on the 1st fan, on the second fan the second shot went 3-4 seconds later by hand.  As a result, a still possible hit, despite the turning away of the enemy, was thwarted.  
        As a result of the strong enemy course change of about 90° the boat ended up on the port side of the convoy where initially only one escort was observed.  The escort seemed to take his old position in the screen at a higher speed after the change in course, so had to give up my original intention to shoot tube 3 and the two-fan 5 and 6 immediately, so as not to be seen by the escort.  Therefore I ran for a fresh start from ahead.  
        Either the destroyer, who is standing in the middle of the convoy as sweeper, performed a planned movement to port, or he had seen the boat in spite of the dark horizon by the strip of foam; in any case, he turned to port and was initially in favorable attack position. bow left target angle 50° about 2000 meters.  I order the stern two-fan to be shot immediately and took the destroyer directly astern.  However, almost at the same moment he turned further to port until he showed bow right target angle 10-20° and then directly towards at target angle 0°.  At this moment the port escort also turned towards the boat at target angle 0°.  
        I went to AK, to escape both followers on the surface if possible but did not succeed.  The range amounted to about 1200 meters.  The destroyer shot 3-4 star shells, after that explosive ammunition  
        I order "Crash dive" and immediately go to depth A +20 meters.  
           
           
           
Sun and Moon Data 12.04.43
 
- 14 -
 
           
           
           
    continued      
    12.04.43   The boat got under very well.  At depth A -40 meters the first depth charges fell, still relatively far off.  Already the second series laid closer, and by the third the distance may have amounted to 100-200 meters.  
        I ordered depth A +70 meters.  Fortunately the boat was well trimmed and weighted and was easily held at this depth.  All auxiliary motors including the gyro compass, except for main rudder and diving plane motors were secured.  
        The flooding mechanism was put in operation twice; the first time at the beginning of the depth charge pursuit, the second time about half an hour later.  
           
    03.30   Up to 03.30 hours several depth charge series were thrown at short intervals (up to 10 units).  From listening observations 2, at times 3 escorts participated in the depth charge and listening pursuit.  
           
    04.55   Further depth charges followed at 04.55 hours and the last at 06.40 hours.  By conservative estimate, a total of at least 50 depth charges were used against the boat.  
        Since I could not count on shaking off the pursuers before day break, I remained at depth A +80 meters and ran off at silent running on course 150° by the magnetic compass.  
        In the course of the entire depth charge pursuit between the depth charge series various explosive depth sounder-like sounds were perceived, these came in groups of 2-3.  Other locating sounds were not observed. Further information about the explosive sounding sounds cannot be given.  
           
    10.45 AK 5936 After the nothing more was heard of the escorts for two hours and only the depth charge pursuit of another boat at great range, were measures taken to surface and the boat went to periscope depth at silent running.  All around sweep showed nothing.  
           
    11.25 AK 5936 Ordered surfacing.  After surfacing the tubes were reloaded and then dove again because during the depth charge pursuit the clutches and E-motors showed irregularities.  
        Damage could be corrected by on board means.  
        The behavior of the crew during the entire pursuit was good.  
           
           
           
Sun and Moon Data 12.04.43
 
- 15 -
 
           
           
           
    continued      
    12.04.43      
    12.00 AK 5938 Day's run:  90 nm  
           
    16.00 AK 6474 Outgoing Radio Message 1503/12/708:  
        01.23 hours naval square AK 5931 two two-fan miss on tanker, steamer, severe depth charge pursuit.  Damaged clutches, E-motors, batteries repaired. Fully operational.  160 cbm.  In pursuit.  
           
        Came to course 75° at highest speed to pursue.  
           
    20.00 AK 6548    
           
    13.04.43 North Atlantic    
    00.00 AK 6643    
           
    01.00   Outgoing Radio Message 0100/13/728:  
        At best it will take until the afternoon of 13 April to catch up with the convoy.  Position now naval square AK 6628.  SW 2-3, . . . . .  Request orders.  
           
    04.00 AL 4424    
           
    04.40   Incoming Radio Message 0423/13/732:  
        To Lerche.  1.) . . . . . . . .  
        2.)  Junker break off and head for naval square BC 34.  
           
    05.15 AL 4431 Came to course 240° at transit speed.  
           
    08.00 AL 4443    
      SSW 4-5, Sea 4, overcast, rain, Vis. moderate    
           
    11.20   Incoming Radio Message 1044/13/739:  
        To Lerche.  1)  Break off operation on convoy.  . . . . . . .  
        2)  All boats, . . . . . . . , head for naval square AK 81.  
        3)  . . . . . . . .  
           
        Came to course for new position at transit speed.  
           
    12.00 AK 6668 Day's run:  231 nm  
           
    16.00 AK 6683    
           
    20.00 AK 6676    
           
    14.04.43 North Atlantic    
    00.00 AK 6598    
           
Sun and Moon Data 12.04.43
Sun and Moon Data 13.04.43
Sun and Moon Data 14.04.43
 
- 16 -
 
           
           
           
    continued      
    14.04.43      
    04.00 AK 6832    
           
    08.00 AK 6817    
      SW 2-3, Sea 1-2, overcast, misty, Vis. changing    
           
    12.00 AK 6761 Day's run:  119 nm  
           
    16.00 AK 6746    
           
    20.00 AK 5991    
           
    15.04.43 North Atlantic    
    00.00 AK 5973    
           
    00.50   Outgoing Radio Message 0016/15/778:  
        Should square in accordance with Radio Message 0423/13/732 or in accordance with Radio Message 1044/13/739 be headed to?  
           
    01.58   Incoming Radio Message 0145/15/780:  
        Proceed in accordance with Radio Message 0423/13/732.  
           
    04.00 AK 5985    
           
    08.00 AK 8225    
      WNW 2, Sea 1, light Swell, cloudy to clear, Vis. medium    
           
    12.00 AK 8217 Day's run:  155 nm  
           
    16.00 AK 8165    
           
    20.00 AK 8183    
           
    23.08   Outgoing Radio Message 2218/15/875:  
        At highest speed will first reach position 16 April . . . . . . .  
           
    16.04.43 North Atlantic    
    00.00 AK 7394    
           
    00.25   Incoming Radio Message 2330/15/876:  
        To Meise.  1)  . . . . . . . .  
        2.)  . . . . . . . . , Junker proceed to patrol line at 9 knots.  
           
    04.00 AK 7377    
           
Sun and Moon Data 14.04.43
Sun and Moon Data 15.04.43
Sun and Moon Data 16.04.43
 
- 17 -
 
           
           
           
    continued      
    16.04.43      
    08.00 AK 7522    
      SW 2, Sea 1, overcast, Vis. bad, fog    
           
    10.33 AK 7515 Carried out test dive, in so doing all around listening.  No results.  
           
    12.00 AK 7514 Day's run:  196 nm  
           
    12.38   Incoming Radio Message 1220/16/885:  
        To Meise.  . . . . . . . .  
        Boats that are still not in the line halt.  
           
    14.07 AK 7437 Due to continual fog dive for all around listening.  No results.  
           
    16.00 AK 7434    
           
    20.00 AK 7436    
           
    21.51 AK 7522 Incoming Radio Message 2059/16/891:  
        1)  . . . . . . . .  
        Brosin to Popp fit into the accordingly.  
        2)  Entire group on 17 April 10.00 hours in patrol line from AJ 6782 via BD 1154 to BD 4231.  
        Headed for position at GF.  
           
    17.04.43 North Atlantic    
    00.00 AK 7277    
           
    04.00 AK 7174    
           
    08.00 AJ 9374    
      SW 2, Sea 1, overcast, Vis. bad, fog    
           
    09.40 AJ 9283 Reached position in patrol line.  Test dive.  Afterwards at lower transit speed back and forth in position.  
           
    12.00 AJ 9289 Day's run:  238 nm  
           
    14.47 AJ 9282 Incoming Radio Message 1255/17/807:  
        . . . . . . . . , Junker, . . . . . . . . , on 19 April at 08.00 hours be in patrol line from AJ 5798 via AJ 9491 via AJ 9898 to BC 3641.  . . . . . . . .  
        Headed for new position.  
           
           
Sun and Moon Data 16.04.43
Sun and Moon Data 17.04.43
 
- 18 -
 
           
           
           
    continued      
    17.04.43      
    16.00 AJ 9285    
           
    20.00 AJ 9284    
           
    18.04.42 North Atlantic    
    00.00 AJ 9192    
           
    04.00 AJ 9181    
           
    08.00 AJ 8368    
      W 5-6, Sea 4, overcast, Vis. good    
           
    11.38 AJ 8349 Dived to proceed submerged with separated brief periscope observations and repeated surfacing for navigation fix to remain unseen if possible.  
           
    12.00 AJ 8349 Day's run:  172 nm  
           
    16.00 AJ 8348    
           
    20.00 AJ 8293    
           
    23.54 AJ 8392 Surfaced again to continue the transit on the surface.  
           
    19.04.43 North Atlantic    
    00.00 AJ 8392    
           
    04.00 AJ 8391    
           
    08.00 AJ 8382    
      WSW 6, Sea 5, overcast, Vis. changing, intermittent rain and snow squalls    
           
    12.00 AJ 8373 Day's run:  52 nm  
           
    16.00 AJ 8532    
           
    20.00 AJ 8293    
           
    20.30 AJ 8347 Reached position.  
           
    20.04.43 North Atlantic    
    00.00 AJ 8374    
           
    04.00 AJ 8374    
           
    08.00 AJ 8344    
      W 6, Sea 5, overcast, Vis. good    
           
           
           
Sun and Moon Data 17.04.43
Sun and Moon Data 18.04.43
Sun and Moon Data 19.04.43
Sun and Moon Data 20.04.43
 
- 19 -
 
           
           
           
    continued      
    20.04.43      
    11.13 AJ 8347 Incoming Radio Message 0959/20/845:  
        Group Meise.  Immediately course north, high speed.  
           
    11.36 AJ 8347 Incoming Radio Message 1045/20/847:  
        Group Meise.  In previous order . . . . . ,  . . . . . , on 21 April at 10.00 hours be in patrol line from AJ 1684 via AJ 6117 to AJ 6997.  
           
    12.00 AJ 8347 Day's run:  160 nm  
        Headed for ordered position.  General course 350°.  
           
    16.00 AJ 5868    
           
    20.00 AJ 5529    
           
    21.04.43 North Atlantic    
    00.00 AJ 5258    
           
    04.00 AJ 2797    
           
    08.00 AJ 2756    
      W 5, Sea 4, few clouds, Vis. good    
           
    09.32 AJ 2756 Reached position.   
        By sun navigation fix over the course of the day a difference between dead reckoning and actual position of 27 nm in 185°T.  No celestial navigation fix was possible for 36 hours due to weather conditions.  
           
        Incoming Radio Message Short Signal from Trotha:  
        Convoy naval square AJ 2772, eastbound, 8 knots.  
           
        By the time group the enemy position was taken as for 09.00 hours, as was also evident in B.d.U. confirmation Radio Message 0952/21/868.   
        Therefore I assumed that at 10.00 hours the enemy was still to the southwest and after a test dive moved back and forth at the reached position.  
        During the aforementioned test dive there was a heavy water intake into the boat (about 6 tons) through a not closed diesel exhaust gas valve so that the test dive had to be broken off.  After repair of the damage and repeat of the the test dive the lubricating oil had to be replaced in both main clutches because there was sea water in it.  (duration 40 minutes).  
           
           
           
Sun and Moon Data 20.04.43
Sun and Moon Data 21.04.43
 
- 20 -
 
           
           
           
    continued      
    21.04.43      
    12.00 AJ 2759 Day's run:  228 nm  
           
        After repair of the damage ran at slow transit speed 1 1/2 hours to the north so that in no case can the enemy pass through in this direction undetected. Visibility at this time 10-12 nm interrupted by occasional brief snow squalls.  
           
    14.00 AJ 2755 Came about.  
        Actually the convoy had already broken through to the north at this time, taking into account the aforementioned navigation fix and the time differences existing in the information received so far. (See Radio Message ßß 0908 - Radio Message 0952/21/868 - Radio Message 1011/21/877, the latter received on the boat at 15.24 hours.)  
        After receiving new sun navigation fixes it was clear to me that we were already behind the convoy.  This was confirmed by receipt of Radio Message ßß 19.30 hours with enemy position AJ 2833.   [from U-306 (Trotha)]  
           
    14.30 AJ 2753 Came to ENE course.  
        At first because of heavy stern sea (bridge repeatedly runs full from astern) only HF and on cross courses before the sea so that for the first night there was only a slight prospect of a timely approach to convoy  
           
    16.00 AJ 2791    
        After weather improvement pursued at 15, occasionally 16, knots.  
    20.00 AJ 2856    
           
    22.04.43 North Atlantic    
    00.00 AJ 2924    
           
    04.00 AJ 3477 New weather deterioration forces a speed reduction.  
           
    08.00 AJ 3485 At the breaking of early dawn still nothing is seen of the convoy (visibility was sometimes very bad, down to 500 meters), which also attributed to the navigation inaccuracy of the reporting boats (Trotha, Holtorf, Krüger).  
           
    12.00 AJ 3495 Day's run:  241 nm  
           
           
Sun and Moon Data 21.04.43
Sun and Moon Data 22.04.43
- 21 -
 
           
           
           
    continued      
    22.04.43      
    12.45   Incoming Radio Message 1203/22/135:  
        Request for position reports by Short Signal.  
           
    14.00 AJ 3490 Since receiving Radio Message 0430/22/189 from Trotha no new contact keeper reports.  Suspect the enemy continued on an easterly course and 7-9 knots, this was confirmed by Radio Incoming Message 1544/22/102.  
        Therefore continued on course 75° and according to the weather conditions at highest possible speed.  
           
    14.25   Outgoing Radio Message Short Signal:  
        Position naval square AJ 3490.  
           
    16.00 AJ 3581 No air observed during the entire day.  
           
    20.00 AJ 3566    
           
    23.04.43 North Atlantic    
    00.00 AJ 3646    
           
    01.15 AJ 3654 Incoming Radio Message 2345/22/117:  
        Orders for "Meise" for new patrol line.  
        Headed for new position.  
           
    02.47 AJ 3665 Incoming reconnaissance Radio Message 0213/23/119 from Trotha:  
        Convoy located 24.00 hours AJ 3299, easterly course.  
        Operated on convoy.  
           
    04.00 AK 1718    
           
    08.00 AK 1736    
      NNW 2-3, Sea 1, light Swell, cloudy, Vis. good except for isolated show showers    
           
    12.00 AK 1657 Day's run:  237 nm  
        Accurate sun navigation fix gives a difference between dead reckoning and actual position  of 83°T, 50 nm; this large navigation offset is is due to the fact that on the day before the navigation fix was already very inaccurate due to very bad weather conditions and also   - caused by inaccuracy of the speed measurement system - a low speed measurement.  
        This easterly correction later worked out to our advantage.  
           
           
           
Sun and Moon Data 22.04.43
Sun and Moon Data 23.04.43
 
- 22 -
 
           
           
           
    continued      
    23.04.43      
    16.00 AK 1622 Operated further by continual contact keeper reports.  Am ahead of the convoy and because the weather is expected to continue for the night (winds from W to NNE), intend to maneuver to the north on the windward side of the convoy.  
           
    20.00 AK 1436 Rapid weather improvement.   
        Visibility 15-20 nm.  Sea 1, low Swell.  
           
        On the basis of the last contact keeper report came to a westerly to southwesterly course, as intended the boat is positioned north of the convoy.  
           
    21.00 AK 1438 Two flying boats sighted at long range. Initially dived so as not to be recognized prematurely.  
    21.47   Surfaced again.  Shortly thereafter smoke clouds in sight in direction 214°T which were soon recognized as belonging to the convoy.  
           
    22.15   Outgoing Radio Message Short Signal:  
        Have contact.  
           
        Due to the good visibility must hold contact at a range of approximately 15 nm.  
           
        Boat angled in because the horizon to the south gradually became a little obscured, closed in steps.  
           
    22.56 AK 2317 Destroyer masts in sight, turned away.  
           
        Visibility decreased as the sunset gradually set in, especially in the direction of the enemy, while the horizon behind the boat towards NW remains sharp contrary to expectations.  
        This circumstance probably also meant that the boat was seen by the destroyer.  
        At this time, the clouds of smoke slowly became fainter, resulting from a change in the course of the convoy in a south-easterly direction.  
        After sighting the destroyer visibility deteriorated.  To the SE and S dark rain and snow bands.  
           
           
           
Sun and Moon Data 23.04.43
 
- 23 -
 
           
           
           
           
    24.04.43 North Atlantic    
    00.00 AK 2318 Boat advanced in the direction of the last enemy bearing.  
           
    00.51 AK 2316 Escort in sight (bearing 180°T).  Moved off.   
        Gradually angled in again, in so doing frequently got into snow storms. After they passed nothing was seen of the convoy.  
           
    02.17 AK 2327 Dived for all around listening.  Sound band in 135° to 145°T.  
           
    02.30 AK 2327 Surfaced and initially continued to run in the direction of the sound band.  
           
    02.51 AK 2328 Pursued in 110°T, the direction of the bearing signals from   "Freyberg" .  
           
    03.22 AK 2329 Shadow in sight bearing 90°T (broad target angle); suspect the escort that was ahead of the boat at 00.51 hours and forced us off.  Angeled away from the escort unseen and maneuvered ahead.  
           
    04.13 AK 2327 New shadow in sight. The same picture as at 03.22 hours.  
        I hope that the next zigzag of the convoy is again to the north and brings me into shooting position before the beginning of dawn.  
        However, the slowly rising moon has to hide again  
           
    05.47 AK 2414 Initially one shadow in sight, taken as an escort.  In 20° echelon.  
           
    05.50 AK 2414 With rapid visibility improvements about 10 vessels in sight.   
        All tubes ready.  Range initially still too great (5000 to 6000 meters).  Target angle about 90°.  
        Closed, was very difficult with prevailing smooth sea and moonlight.  
        Intention:  Bow four-fan, while turning away stern two fan.  
           
    05.57 AK 2415 Out of the haze the same escort again, because the range from me to him with a sharp target angle amounts to only 2000 meters, continuing towards the convoy is not possible at this moment.  
           
    06.00 AK 2415 Turned away with the intention, to fire a stern two-fan at the escort.  
           
           
Sun and Moon Data 24.04.43
 
- 24 -
 
           
           
           
    continued      
    24.04.43      
    06.02 AK 2415 Intention spoiled by a sudden turn away of the escort about 60-80° to starboard.  Immediately thereafter recognized that the entire convoy had turned away to starboard to about course 90°, target angle around 150°.  
           
        Turned to a parallel course with the convoy.  
        Now again bright moonshine, so that steaming along at highest speed in the immediate vicinity of the convoy is impossible.  
        Because with the imminent early dawn another night attack is pointless, angeled away, to maneuver ahead at the limit of visibility by day.  
           
    06.50 AK 2413 Outgoing Radio Message Short Signal:  
        Convoy 06.15 hours naval square AK 2415, course eastward.  
           
        It is a shame that there is not enough time available to exploit this position and get to a favorable shooting range.  
        In my opinion, the weather and visibility conditions this night were very much in favor of the convoy leader, who also understood it very well, and thwarted the U-boats attack possibilities by course changes at the right moment.  
        I have the impression that the enemy has the means to enable them to detect the boats before they shoot, and then, with the help of an excellently organized order transmission, to direct the convoy route and in many cases to thwart success even after a shot is fired.  
           
    07.29 AK 2287 "Crash dive!"  Dived for sea-based aircraft.  
           
    07.35 AK 2287 Surfaced again.  
           
    08.00 AK 2287 Searched for contact on easterly and southeasterly courses.  At times heavy show squalls, in general however, otherwise good visibility.  
           
    10.30 AK 2433 About 10.30 hours smoke clouds and mastheads in sight.  
           
           
Sun and Moon Data 24.04.43
 
- 25 -
 
           
           
           
    continued      
    24.04.43      
    10.59 AK 3311 Sea-based aircraft bearing 200°T.  No attack.  
           
    11.07 AK 3311 Outgoing Radio Message Short Signal:  
        10.30 hours convoy naval square AK 3317, easterly course.  
           
    11.10   Outgoing Radio Message Short Signal:  
        Sea-based aircraft.  
           
        Ran to the port side of the convoy and held contact.  In so doing several aircraft coming from Iceland were sighted,  which continually circle the convoy.  
        The boats remains unnoticed by all the aircraft.  
           
    12.00 AK 3179 Day's run:  242 nm  
           
    13.12 AK 3187 Outgoing Radio Message Short Signal:  
        12.45 hours convoy naval square AK 3351 changed course to the south.  
           
        Due to an error in the Radio Message inadvertently "changed course to the north" was sent.  
        Error corrected in Radio Message 1628/24/119.  
           
    14.20 AK 3325 Outgoing Radio Message 1326/24/111:  
        Continuous air from Iceland, relief every three hours.  9 T III, 3 T V, 8 Atos, 71 cbm.  
           
    14.43 AK 3326 Flown at by a flying boat escorting the convoy from 85°T.  Range = 3000 meters, altitude 200 meters.  
        "Crash dive!"  At depth A -40 meters one aircraft bomb, very close.  Light damage.  Boat went well to depth A meters.  
           
    16.00 AK 3326 Surfaced.  Pursued the convoy.  
           
    16.28 AK 3326 Outgoing Radio Message 1628/24/119:  
        14.43 hours dived before aircraft square AK 3326, close aircraft bomb, light damage, contact lost.  Last convoy position naval square AK 3351 at 12.45 hours, southerly course.  
        Short Signal 1312 must mean south.  
           
    15.15 AK 3334 Dived before flying boat.  Passing flight.  No attack.  
           
    17.45 AK 3334 Surfaced, continued on.  
           
    18.48 AK 3339 Dived before an approaching flying boat from 250°T.  Range = 3000 meters, altitude 400 meters.  No bombs, suspect in return flight.  
           
Sun and Moon Data 24.04.43
 
- 26 -
 
           
           
           
    continued      
    24.04.43      
    20.00 AK 3417    
           
    20.59 AK 3417 Surfaced to repair the damage, which had turned out to be a bit more extensive in terms of the battery and electrical system; moved off to the south.  
           
        In the mean time increasing weather deterioration, freshening wind from the NE to NNE Strength 5.  Suspect convoy is at least 40 nm to the east-southeast, was later confirmed by a contact keeper report.  
        Regaining contact and reaching a position for daytime attack before the break of dawn, is not to be expected given the increasing weather deterioration, even with a completely operable boat.  
           
    22.48 AK 3399 Outgoing Radio Message 2114/24/127:  
        21.00 hours position naval square AK 3417.  Repeatedly forced off by continual air.  Set off for repairs.  
           
    25.04.43 North Atlantic    
    00.00 AK 3399    
           
    04.00 AK 3565    
           
    08.00 AK 3734    
      NW 3-4, Sea 2-3, cloudy, Vis. good    
           
    12.00 AK 3753 Day's run:  172 nm  
           
    15.14 AK 3757 Incoming Radio Message 1240/25/153:  
        Orders to take up a new position line for slow NE-convoy.  
           
        Headed for new position.  
           
    16.00 AK 3758    
           
    20.00 AK 3717    
           
    26.04.43 North Atlantic    
    00.00 AK 2697    
           
    04.00 AK 2646    
           
           
           
           
Sun and Moon Data 24.04.43
Sun and Moon Data 25.04.43
Sun and Moon Data 26.04.43
 
- 27 -
 
           
           
           
    continued      
    26.04.43      
    05.49 AK 2539 Shadow in sight astern to starboard bearing 95°T.  Turned towards.  While doing so recognized it as a large vessel.  Came to highest speed, pursued.  
        Shadow quickly out of sight.  Stopped briefly to listen.  Fast propeller sounds in relative bearing 340°, turned towards. Nothing further seen of the vessel.  Dived to listen.  Clear fast propeller sounds, noticeably fainter.  Surfaced.  
        The ship ran at a minimum of 18 knots, pursuit with the imminent breaking dawn is pointless, turned away on course to take up the initial position.  
           
    07.08 AK 2536 Outgoing Radio Message Short Signal:  
        06.45 hours AK 2615 independent course northeast, high speed.   
        Acknowledgment by Control not heard.  In confirmation Radio Message 1001/26/170 last group "71°" confirmed incorrectly.  
        Because I presume that the remaining boats are to the west of my position, refrained from sending a correction.  
           
    08.00 AK 2397    
      N 0-1, Sea 0, light Swell, few clouds, Vis. good    
           
    09.10 AK 2386 Reached position on the position line.  
           
    12.00 AK 2386 Day's run:  173 nm  
        With the flat sea repaired damage from seas and aircraft bombs in the over deck.  Corrected an oil trace.  
           
    16.00 AK 2386    
           
    20.00 AK 2387    
           
    27.04.43 North Atlantic    
    00.00 AK 2386    
           
    04.00 AK 2386    
           
    08.00 AK 2382    
      NE 0-1, overcast, Vis. good    
           
Sun and Moon Data 26.04.43
Sun and Moon Data 27.04.43
 
- 28 -
 
           
           
           
    continued      
    27.04.43      
    10.30 AK 2386 Incoming Radio Message 1038/27/191:  
        As new Group "Star".  
        . . . . . . . . , . . . . . . . . , . . . . . . . . , Junker, . . . . . . . . , from 28 April at 09.00 be in patrol line from AD 8731 via AK 3523 to AK 0329.  
        Slow SW-convoy expected tomorrow.  
           
    12.00 AK 2386 Day's run:  124 nm  
           
    12.25 AK 2386 Meeting with "U-Pückler".  
           
    16.00 AK 2471    
           
    19.20 AK 2485 Own U-boat sighted.  Recognition Signals exchanged.  ("U-Mäder")  
           
    20.00 AK 2486    
           
    28.04.43 North Atlantic    
    00.00 AK 2492    
           
    04.00 AK 3345    
           
    08.15 AK 3328 Reached starting position.  
           
    08.21 AK 3329 Dived for listening observation.  No results.  
      ESE 1, Sea 0-1, cloudy, Vis. medium    
        Continued submerged to remain unseen in any case.  
           
    12.00 AK 3337 Day's run:  118 nm  
           
        Surfaced.  
           
    12.15   Incoming Radio Message 1040/28/123:  
        . . . . . . . .   convoy position AD 8731.  Witzendorff.  
        Operated on convoy.  
           
        In the course of the early afternoon significant visibility deterioration, sometimes down to 1 nm.  
           
    12.30   Incoming Radio Message 1028/28/121:  
        To Star.  1)  Passing of an eastbound convoy is expected from today.  Utilize favorable attack opportunities.  
        2)  Boats in line remain unseen in any case.  . . . . . . . .  
           
    16.00 AK 2296 Dived for all around listening for eastbound convoy.  No results.  
           
Sun and Moon Data 27.04.43
Sun and Moon Data 28.04.43
 
- 29 -
 
           
           
           
    continued      
    28.04.43      
    16.30 AK 2296 Port diesel out of service due to oil contamination.  Duration of repairs cannot be foreseen.  
           
        Continued to operate.  
           
    18.01 AK 2291 Outgoing Radio Message 1801/28/133:  
        From 16.30 hours malfunction in port diesel.  Duration unknown, continuing operation.  Position AK 2291.  
           
    20.00 AK 2281 Diesel malfunction determined.  
           
        The positions given from Witzendorff, Kandler and Mäder are not close to one another.  Therefore kept well ahead to be certain.  
           
    29.04.43 North Atlantic    
    00.00 AK 2125    
           
    02.52   Outgoing Radio Message Short Signal:  
        Request bearing signals from contact keeper.  
           
    02.58 AD 7891 Dived for all around listening.  Sound band from 355° to 15°T.  
           
    03.11 AD 7891 Surfaced.  Initially continued on old course.  
           
        By Radio Message 2015/28/139 from Witzendorff the convoy consists of at most 6 steamers.  
           
    04.00 AD 7856 "To Action stations!"  
           
    04.12 AD 7853 Dove again to listen.  Sound bearings in 40°T, from 80-95°T and in 130°T.  
        Surfaced and came to course 70°.  
           
    04.45 AD 7853 Escort in sight 10° to port.  
        Shortly thereafter convoy sighted ahead to starboard.  Boat is positioned exactly ahead of the convoy.  There is still no clear picture of its expanse.  A minimum of 10 steamers are seen and 3 to 4 destroyers or escorts, they are positioned ahead and ahead  to both sides.  
        Judging by the rather strong forward screen and subsequent impressions, the convoy is much larger than Witzendorff reported in Radio Message 2015/28/139, according to which there should be no more than 6 steamers.  
           
           
           
Sun and Moon Data 28.04.43
Sun and Moon Data 29.04.43
 
- 30 -
 
           
           
           
    continued      
    29.04.43      
    04.45 AD 7853 On the contrary I believe the report from Mäßenhausen in Radio Message 1130/29/154 is correct, by which the convoy's strength is about 30 vessels.  
        I suspect that a search group stationed east of Greenland took over the convoy in the evening of 28 April to strengthen the screen during the night and on 29 April took over prosecution of the U-boats that were forced to submerge because I can not imagine that the actual escort could spend practically an entire day on the pursuit of individual boats.  
        Visibility is changing.  The convoy comes from the dark horizon, while own boats are positioned before the unfavorable west horizon  
        Convoy course is proximately 220°.  Initially came to course 180° to get free of the escort ahead to port.  
        Intention:  turn in to port to fire all tubes at the foremost ship of the convoy.  Range must must be long due to the unfavorable (to the boat) visibility conditions.  
        During the approach the convoy turns to starboard to about course 270°.  
        Turned after.  
        Despite the still somewhat sharp target angle I decide to shoot immediately based on the experience of the previous convoy battle.  
           
    05.14 AD 7856 Four-fan on the third steamer, seem especially large (5000-6000 GRT)  
        Target speed = 8 knots, target angle = 40°, range = 4000 meters, target length 100 meters, depth 3 meters, torpedo speed = 30 knots.  
        Turned away.  
           
    05.17 AD 7856 Stern two-fan on escort, behind which at grater range lay the steamer of the convoy.  
        Target speed = 10 knots, target angle = 30°, range = 2500 meters, target length 100 meters, depth 3 meters, torpedo speed = 30 meters.  
           
        Outgoing Short Signal:  
        Have contact.  
           
        7 1/2 minutes after the four-fan was shot and about 7 minutes after the two-fan each one perfect detonation was heard.  Effect could not be observed due to diving.  
           
           
Sun and Moon Data 29.04.43
 
- 31 -
 
           
           
           
    continued      
    29.04.43      
    05.17 AD 7856 It is thought possible that in in one case the torpedoing may be the 7000 tonner sunk by Mässenhausen in AD 7846 with 2 coup de grâce reported in Radio Message 1455/29/179.  
        I tried to move off ahead of the convoy to port.  However due to the course change of the convoy this didn't work because apparently  the destroyer stationed to port of the convoy was closing up on a NW-course.  
           
    05.23 AD 7856 At 05.23 hours this destroyer came from ahead, when abeam to port it turned towards me at target angle 0°.  I order "Hard to starboard!" however recognized that the destroyer had already seen me and was running at the boat at high speed.  Range about 1200 meters.  
           
    05.24 AD 7856 "Crash dive!"  
        Initially went to depth A +20 meters, afterwards steered at A +80 meters.  
        At depth A +60 meters the first depth charge series fell, still relatively distant.  
        In the following 2 hours up to 08.00 hours there were a further 6 series (up to 10 depth charges each series), of these two lay especially close directly over the boat.  
        The entire pressure hull was violently shaken.  Before each depth charge series sounds like explosive sounding were heard as observed during the first depth charge pursuit on 12 April.  The sounding sounds were heard individually and in groups, moreover, they followed more frequently but more irregularly than the first time.  
        A fixed system for the sounding phenomena was not recognized on this occasion. On the other hand, after the third actuation of the flooding mechanism, three sounding impulses, which ran through one another in succession, with up to 10 echoes were observed.  Thereafter the boat was overrun by the destroyer without depth charges.  
        It was thought possible that the soundings were unfavorably affected by the flooding mechanism.  
        One major failure determined was significant binding of the forward diving plane with loud knocking sounds; when put in "Hard up" the plane jammed in this position, however it could be freed again   
           
           
           
           
Sun and Moon Data 29.04.43
 
- 32 -
 
           
           
           
    continued      
    29.04.43      
        For the following period it was limited to "Up 15°".  
        In addition to other conspicuous knocking sounds inside and outside the boat a considerable number of pressure gages, lamps and electrical equipment failed, however the failures had no limiting consequences.  
        In contrast, Battery I again had severe cracking and as a result again acid was detected in the bilge.  
        For the most part, vents and outboard closures held tight; only in certain places was the dripping water inflow a little stronger than before, so that about every hour lesser depths had to be sought to pump.  
        The failure of the magnetic compass was made unpleasantly noticeable because of the need to turn the gyro-compass off for silent running, thus it was impossible to control the course of the boat.  
        This circumstance later forced me - after restarting the gyroscope (around 20.00 hours) - to wait 5 hours after surfacing until the swinging of the gyroscope returned to normal, in order not to run in the wrong direction and thus into the hands of the enemy again.  
        It seems appropriate to me to give each U-boat a boat compass, with the aid of which it can at least determine course changes and even if only accurate to within 20° to 30° the main points of the compass.  
        After the initial one and a half hours of more or less close by escort sounds, calm followed.  Between 09.30 and 17.00 hours at various time intervals more depth charge series, as well as individual throws of 1-3 depth charges, in between sounding sounds were often heard as well.  
           
    12.00 AD 7856 Day's run:  219 nm  
      (Position inexact due to securing of the gyro-compass) The last throws lay, as far as could be determined, even further away; between 12.00 and 15.00 hours propeller noises were no longer detected, however they [depth charges] occurred again.  
        I do not consider it impossible that some of the detonations that occurred in the early afternoon were the time-mechanism, buoy-mounted depth charges mentioned in "Standing Order No. 37".  
           
           
           
Sun and Moon Data 29.04.43
 
- 33 -
 
           
           
           
    continued      
    29.04.43      
    15.00   After 15.00 hours however there were sounding sound for a long time.  
        As it turned out after surfacing later, it had freshened considerably from the west. I believe that it is largely thanks to these circumstances that the boat could gradually escape the listening pursuit and locating.  
        After 1700- 1900 hours nothing significant occurred, the gyroscope was started again, and I intended to surface around 24.00 hours.  
           
    19.00   Because the CO2 level had risen to approximately 3%, at 19.00 hours potash cartridges were distributed and emergency breathing apparatus donned. Moreover, the behavior and condition of the crew was good and no further measures were required.  
           
    21.30   Between 21.30 and 23.15 hours there were 3 depth charge series of up to 5 depth charges were still heard, which in my opinion were not meant for us, but which caused me to wait to surface until late dusk so as not to attract the pursuers again.  
           
    30.04.43 North Atlantic    
    00.00 AD 78    
           
    .1040 AD 78 Surfaced.  Moved off at highest speed to the ENE.  
           
        The thorough examination of the operational readiness of the boat which was carried out after surfacing, revealed the stiffness and the loud knocking noise from the forward diving planes as the main limitation, as well as considerable self noise while cruising submerged, which made silent running impossible in a similar similar situation.  
        The convoy had a minimum of 20 hours head start and in the current weather conditions - there prevailed WSW-Wind Strength 5, Sea 4, with corresponding heavy Swell - regaining contact with the convoy was not to be expected in the next 48 hours.  
        Therefore I decided, to begin the return transit, because my fuel inventory had dropped to 47 cbm.  
           
           
Sun and Moon Data 29.04.43
Sun and Moon Data 30.04.43
 
- 34 -
 
           
           
           
    continued      
    30.04.43      
        Due to transmitting side difficulties in radio communications the report concerning the pursuit of the last 24 hours was first sent after 3 days, that is on 1 May.  
        The said Radio Message had the following wording:  
        Outgoing Radio Message 1733/1/128:  (from 1 May)   
        29 April 05.14 hours naval square AD 7856 four and two-fan, heated, long range, each a perfect detonation after 7.5 and 7 minutes.  Effect not observed.  
        15-huor listening, locating and severe depth charge pursuit.  Forward diving plane stiff, loud noise, further unacceptable self noise.  
        Return transit.  43 cbm.  Torpedo inventory:  4 T III, 2 T II, 8 Atos.  
           
        Gradually came to southeasterly and southerly courses and proceeded through the center of square AK.  
           
        For the reasons mentioned above the weather report requested in Radio Message 2220/30/109 was not sent.  
           
    04.00 AD 7832    
           
    08.00 AD 7955    
      SW 4, Sea 3, few clouds, Vis. good    
           
    10.28 AD 7995 Dived before aircraft.  Altitude 1000 meters, flying direction 300°.  
           
    12.00 AD 7995 Day's run:  141 nm  
           
    16.00 AD 2221    
           
    20.00 AK 2222    
           
    01.05.43 North Atlantic    
    00.00 AK 2228    
           
    04.00 AK 2228    
           
    08.00 AK 2458    
      W 1-2, Sea 1, medium Swell, overcast, Vis. good    
           
    12.00 AK 2622 Day's run:  119 nm  
           
    16.00 AK 2657    
           
    20.00 AK 2667    
           
Sun and Moon Data 30.04.43
Sun and Moon Data 01.05.43
 
- 35 -
 
           
           
           
           
    02.05.43 North Atlantic    
    00.00 AK 2833    
           
    04.00 AK 2853    
           
    08.00 AK 2858    
      SW 6-7, Sea 6, heavy Swell, cloudy to clear, Vis. good    
           
    12.00 AK 2884 Day's run:  134 nm  
           
    16.00 AK 0221    
           
    20.00 AK 0219    
           
    22.41   Outgoing Radio Message 2202/2/144:  
        Weather report.  
           
    03.05.43 North Atlantic    
    00.00 AK 0246    
           
    04.00 AK 0276    
           
    08.00 AK 5323    
      SW 6-7, Sea 5-6, heavy Swell, overcast, Vis. medium    
           
    12.00 AK 5454 Day's run:  81 nm  
           
    16.00 AK 5357    
           
    20.00 AK 5374    
           
    04.05.43 North Atlantic    
    00.00 AK 5535    
    01.16   Outgoing Radio Message 0012/4/180:  
        Weather report.  
    04.00 AK 5565    
           
    08.00 AK 5595    
      SW 3, Sea 2, medium Swell, overcast, Vis. good    
           
    12.00 AK 5835 Day's run:  114 nm  
           
    16.00 AK 5868    
           
    17.06   Sent Short Signal weather report.  
           
    20.00 AK 8311    
           
           
           
Sun and Moon Data 02.05.43
Sun and Moon Data 03.05.43
Sun and Moon Data 04.05.43
 
- 36 -
 
           
           
           
           
    05.05.43 North Atlantic    
    00.00 AK 8347    
           
    04.00 AK 8614    
           
    08.00 AK 8674    
      W 1, Sea 0-1, overcast, Vis. good    
           
    12.00 AK 8918 Day's run:  172 nm  
        From 11.37 to 13.24 hours meeting with U-461.  Replaced Metox, Doctor on board.  
           
        According to the last information received the air threat in the Bay of Biscay had continued, in particular in squares BE 50, BE 60, BF 40 and BF 71-73.  Therefore I decide to carry out the return transit south of these squares.  
        I believed the increased U-boat danger in the vicinity of the Spanish northwest and north coast was less dangerous.  
           
    16.00 AK 8949    
           
    19.00 BD 2223 Came to course 130°.  
           
    20.00 BD 2234    
           
    06.05.43 North Atlantic    
    00.00 BD 2345    
           
    04.00 BD 3171    
           
    08.00 BD 3185    
      SW 1-2, Sea 1, cloudy, Vis. good    
           
    12.00 BD 3436 Day's run:  204 nm  
           
        The radio messages on 6 May and the following days revealed a northbound convoy, whose position was first reported by air reconnaissance on 6 May at 10.00 hours in naval square CF 6629 on northerly course.  Group "Drossel" was deployed.  
        There is the possibility that if the convoy steers a northerly course long enough that I might still gain contact on it or on the wounded.  My fuel inventory allows no higher speed than LF.  Likewise, because of the boat's limited operational capacity as a result of the last depth charge pursuit, I did not think I would take a course through the particularly air-endangered area, and search for good luck at a convoy. Since there were no further contact keeper reports after 24 hours in my opinion it would probably not lead to success anyway.  
           
Sun and Moon Data 05.05.43
Sun and Moon Data 06.05.43
 
- 37 -
 
           
           
           
    continued      
    06.05.43      
    16.00 BD 3546    
           
    20.00 BD 3586    
           
    07.05.43 North Atlantic    
    00.00 BD 3836    
           
    04.00 BD 3954    
           
    08.00 BD 3994    
      W 4, Sea 3, light Swell, overcast, Vis. good    
           
    12.00 BE 4114 Day's run:  167 nm  
           
    16.00 BE 4155    
           
    20.00 BE 4277    
           
    08.05.43 North Atlantic    
    00.00 BE 4528    
           
    04.00 BE 4592    
           
    08.00 BE 4913    
      W 4, Sea 3, light Swell, overcast, Vis. medium    
           
    12.00 BE 4953 Day's run:  179 nm  
           
    16.00 BE 4993    
           
    20.00 BE 8112    
           
    09.05.43 North Atlantic    
    00.00 BE 8153    
           
    04.00 BE 8193    
           
    07.00 BE 8278 Came to course 95°.  
           
    08.00 BE 8513    
      NNW 2, Sea 1, medium Swell, overcast, Vis. good    
           
    12.00 BE 8523 Day's run:  172 nm  
           
    16.00 BE 8611    
           
    20.00 BE 8621    
           
           
           
Sun and Moon Data 06.05.43
Sun and Moon Data 07.05.43
Sun and Moon Data 08.05.43
Sun and Moon Data 09.05.43
 
- 38 -
 
           
           
           
           
    10.05.43 North Atlantic    
    00.00 BE 8632    
           
    04.00 BE 9413    
           
    08.00 BE 9434    
      SW 7-8, Sea 6-7, high Swell, overcast, Vis. changing    
           
    12.00 BE 9514 Day's run:  162 nm  
           
    16.00 BE 9526    
           
    20.00 BE 9533    
           
    11.05.43 North Atlantic    
    00.00 BE 9616    
           
    00.08 BE 9616 Dived to proceed submerged.  
        On approaching north Spanish waters dove to proceed submerged at the beginning of darkness.  
        Shortly after submerging the first far off depth charge detonations were heard.  This condition lasted the entire transit through the Bay of Biscay, mostly during the day.  It is noteworthy that both aircraft and search groups were involved in this, as in some cases larger series were heard in rapid succession. Moreover, in these days the Gibraltar-England convoy traffic was rather slow, so the presence of enemy surface forces is explainable.  
        During the day or in one are or another, there may also be scare bombs as they repeated themselves each day at approximately the same time, and consisted chiefly of 2-3 depth charges.  
        Overall, in the days and nights of 11 to 14 May by careful counting 150 detonations, mostly heard at great range.  
        The boat dived at daybreak and proceeded on the surface each evening for about 2-3 hours to charge the battery and ventilate.  
        The further north the boat got, the shorter the over water cruise became.  Additionally during the day two or three times the boat surfaced briefly to take a sun navigation fix.  
           
           
           
Sun and Moon Data 10.05.43
Sun and Moon Data 11.05.43
 
- 39 -
 
           
           
           
    continued      
    11.05.43      
    04.00 BE 9625    
           
    08.00 BE 9639    
      SSW 2, Sea 1-2, clear, Vis. good    
    12.00 BF 7457 Day's run:  150 nm  
           
    16.00 BF 7458    
           
    20.00 BF 7467    
    22.41 BF 7549 On 105 cm steady tone medium Volume, suspect aircraft.  Dived.  
    12.05.43 Bay of Biscay    
    00.00 BF 7557    
           
    04.00 BF 7559    
           
    08.00 BF 7644    
      SSW 2, Sea 1, cloudy to clear, Vis. good    
           
    12.00 BF 7651 Day's run:  105 nm  
           
    16.00 BF 7629    
           
    20.00 BF 7635    
           
    16.00 BF  7629    
           
    20.00 BF 7635    
           
    13.05.43 Bay of Biscay    
    00.00 BF 8425    
           
    04.00 BF 8426    
           
    08.00 BF 8678 Came to course 20°.  
      E 1, Sea 0, clear, Vis. good    
        From the current position of the boat will react the convoy intake point on 15 May at 11.00 hours.  
           
    12.00 BF 8273 Day's run:  99 nm  
           
    16.00 BF 8273    
           
    20.00 BF 8254    
           
    14.05.43 Bay of Biscay    
    00.00 BF 8223    
           
    04.00 BF 5794    
           
    08.00 BF 5765    
      N 1, Sea 0-1, cloudy to clear, Vis. good    
           
           
Sun and Moon Data 11.05.43
Sun and Moon Data 12.05.43
Sun and Moon Data 13.05.43
Sun and Moon Data 14.05.43
 
- 40 -
 
           
           
           
    continued      
    14.05.43      
    12.00 BF 5738 Day's run:  82 nm  
           
    16.00 BF 5814    
           
    20.00 BF 5811    
           
    15.05.43 Bay of Biscay    
    00.00 BF 5577    
           
    04.00 BF 5571    
           
    05.30 BF 5571 Surfaced.  Headed for the convoy intake point at highest speed.  
    08.00 BF 5554    
      E 1, Sea 0-1, clear, Vis. good    
           
    11.00 BF 6173 Reached meeting point with escort.  
        Taken in convoy.  
           
    12.00 BF 6173 Day's run:  126 nm  
           
    14.30   Arrived in Lorient.  
           
           
           
           
           
           
           
           
           
                                
                    Korvettenkapitän and Kommandant.  
           
           
           
           
           
           
           
Sun and Moon Data 14.05.43
Sun and Moon Data 15.05.43

 

Appendices to U-532's KTB - click on the text at left to proceed to the documents
   
Chart Track chart of entire patrol
   
ChartI Track chart of convoy operation 11-12 April
   
ChartII Track charts of convoy operation 23-24 April
          Chart IIa     23 April 21.00 - 24 April 06.00
          Chart IIb     24 April 07.00 - 12.00
   
Sketch Attack on convoy 29 April

 
 
     
 

Comments of the Befelshabers der Unterseeboote

 
 
on the K.T.B. of "U-532" (Junker) from 25.3.43 - 15.5.43.
 
     
  First patrol of the Kommandanten with a new boat!  
     
 

Thoughtfully and conscientiously operated on 3 convoys and in every case, after good effort, soon gained contact.  Unfortunately, despite many chances, the Kommandant made only one successful attack on 29 April.  In several cases the strong and well-trained defense of the enemy thwarted attacks and delivered very impressive depth charges to the boat.  By shooting earlier from even greater distance as for example on the morning of 24 April the Kommandant would be more likely to succeed.

 
  After the attack on 29 April the boat remained submerged much too long and as a result was robbed of the prospect of gaining contact again.  The use of Bolde was handled very correctly.  
  The lessons learned on this patrol will be very useful for the next undertaking if in every case, the tenacious and hard-won attacking opportunities were also quickly and energetically perceived.  Hesitating too long in the pursuit of "the ideal attack position" is no longer possible today, every chance that makes a shot at all possible, must be perceived with lightning speed and quick decision making with all tubes.  
     
  Accredited success:  
  1 steamer (5000 GRT) torpedoed.  
     
     
    For the Befehlshaber der Unterseeboote  
    - The Chief of the Operations Department -  
                        
     
     
 


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