HMS Dianthus attacked a submarine with her 4-inch gun, 40 mm pom-pom, and depth charges before resorting to ramming. When the first collision did not finish the target, the corvette rammed repeatedly, four times in the account, until the submarine sank. The submarine had made its only two merchant-ship kills that day. Repeated ramming is presented as an exceptional act of persistence, rather than normal anti-submarine practice.
Notable Point · 7:38:39-7:39:36
HMS Dianthus made certain a U-boat could not escape
The Flower-class corvette combined gunfire, depth charges, and repeated ramming against a submarine that had already sunk two merchant ships that day.