U-504 was sunk by ships of the Second Support Group  (HMS Kite, Wren, Woodpecker, Wild Goose and Woodcock) on July 30, 1943

HMS Kite whose Commanding Officer at the time of the sinking of U-504 was the famous U-boat hunter Captain "Johnnie" Walker, DSO and three bars - Captain Walker also served as the Commander of the Second Support Group whose Report of Proceedings can be viewed below

Photograph of HMS Kite courtesy of Mr. Mike Kemble