These documents were made available from the Bibliothek für Zeitgeschichte Stuttgart

Approach sketch with firing diagram.   How was firing data acquired?  Special observations, Defence,  Explanation for miss: 
The shooting data was estimated.  Due to strong Northern Lights and, as a consequence, too great lightness and strong protection had to shoot at great range.  Apparently the range was underestimated.
 
Commentary, analysis and decision:
2-fan.
Miss due to inexact shot data with great shot range.

 

Approach sketch with firing diagram.   How was firing data acquired?  Special observations, Defence,  Explanation for miss: 
Shooting data was plotted.  The shots went at about a 20 second interval.  Because one steamer came into ramming distance, had to turn away hard and dive.  The defense with depth charges began after 6 minutes.
 
Effect on the target,  Height and appearance of the explosive column,  Time to completely sink,  Perception in own boat:
The effect at the target could not be observed because [the boat] dived immediately.  After about half an hour between the depth charge detonations sinking sounds were heard.  On surfacing one steamer was observed burning and sinking, sank at 12.08 hours.  Sinking of the other steamer was observed by the air contact keeper.
 
Commentary, analysis and decision:
3 associated single shots.
2 hits attack shots
1 miss, probably due to under-steering in unfavorable depth conditions and too low shooting range.

 

Approach sketch with firing diagram.   How was firing data acquired?  Special observations, Defence,  Explanation for miss: 
The shooting data was estimated.  No defense.
 
Effect on the target,  Height and appearance of the explosive column,  Time to completely sink,  Perception in own boat:
The effect and the appearance of the explosion column could not be observed because the boat had just undercut.  Due to the heavy Sea State and along with it cross swell the boat was very difficult to steer at depth.  Steamer settled deeper astern and remain lying stopped. Several coup de grâce were shot.
 
Commentary, analysis and decision:
3-fan.
Hit attack shot.

 

Approach sketch with firing diagram.   How was firing data acquired?  Special observations, Defence,  Explanation for miss: 
Steamer lay stopped. However, due to the wind it still made way ahead.  The torpedo broke through the surface twice.  Set depth was 2 meters with torpedo course athwart the running high swell, in this it described a bayonet [made two sharp turns after firing in the shape of a bayonet].
 
Commentary, analysis and decision:
Miss due to speed estimate,  Surface runner in heavy sea and high swell athwart the torpedo course. (torpedo depth = 2 meters.

 

Approach sketch with firing diagram.   How was firing data acquired?  Special observations, Defence,  Explanation for miss: 
The shooting data was estimated.  No defense.
 
Effect on the target,  Height and appearance of the explosive column,  Time to completely sink,  Perception in own boat:
The torpedo hit at the forward edge of the bridge.  High explosion column with strong fiery glow.  Also from the steamer, the smokestack and the engine room skylights flames broke out which were extinguished after about a minute.  Steamer settled deeper in the center, the masts leaned towards each other and immediately afterwards the steamer broke into two parts.  The foreship lifted high out of the water and drifted away quickly.  The aftership sank deeper, propellers came high out of the water.  Was left sinking.
 
Commentary, analysis and decision:
Hit coup de grâce.

 

Approach sketch with firing diagram.   How was firing data acquired?  Special observations, Defence,  Explanation for miss: 
The shooting data was estimated.
 
Effect on the target,  Height and appearance of the explosive column,  Time to completely sink,  Perception in own boat:
It was the foreship of the twice torpedoes steamer. In the ripped open cargo hold a cargo of wood is recognized, so the ship did not want to sink.  About 30-meter high explosion column with bright fiery glow.  The forecastle settled away and the foreship slowly stood on its head.  Was left sinking.
 
Commentary, analysis and decision:
Hit coup de grâce.