Update: I fired two T1 torpedoes at a C2. Result: 1 torpedo explodes close to the C2, other hits the engine room/fuel bunker/something. Big explosion, C2 sinks. Technically, I have attacked a convoy before, but with a different boat, U-516. Sank a Bogue in 3 hits. That was a good day, but unfortunately U-516 and her crew were, for lack of a better term, deleted.