German submarine U-45 (Type VIIB U-boat) conducting speed trials in 1938. On the morning of the 14th of October 1939, U-45 attacked the unescorted convoy KJF-3 about 230 miles southwest of Fastnet and reported the sinking of three big steamers. In fact two ships, Lochavon and Bretagne (total of 19,313 tons) were sunk and the British steam merchant Karamea was missed, because a torpedo detonated prematurely.
