Yesterday (Oct. '41) I went after a small 3-ship convoy in CO51 in the dark. Targetted the small freighter in the center. Approached at flank speed with decks awash. Still wasn't seen at 2500m so I submerged & reduced speed to slow. Launched a T1 at the small freighter and then targetted the Black Swan that was trailing her. Shot another T1 at her and went deep (100m+). Both eels hit their marks & that small freighter and HMS Woodcock suddenly became artificial reefs.
Easily evaded the surviving Black Swan.