13 May 1943. The sinking of U-753
At 08.30 hours, the boat was spotted by a Canadian Sunderland aircraft (423 Sqdn RCAF/G, pilot F/L J. Musgrave) ten miles from convoy
HX-237. AA fire from U-753 prevented an attack, so the Sunderland shadowed the boat for the next 20 minutes, only exchanging gunfire - they fired around 2000 rounds and were hit by one shell.
HMCS Drumheller then forced the boat to dive by gunfire and the Sunderland immediately dropped two depth charges ahead of the swirl. A Swordfish aircraft from the British escort carrier
HMS Biter arrived and marked the diving spot with smoke floats. The corvette was soon joined by
HMS Lagan and together they sank U-753 with depth charges.