Great edit, Jimbuna! Had a blast just a few moments ago. Came across a big convoy with over 15 ships escorted by 3 corvettes or light destroyers. The weather was really rough but I managed to sink all 3 corvettes (using the pizza hull and ammo cheat), then had my damage control team repair the light damage - and then I had some fun with the convoy.
Too bad that 5 of the ships were neutral - American cargo ships. I didn't sink them but I did fire on the Sherman tanks on their decks!
By the way, is there any way to fix the save game issue here? Whenever I load a saved game after a few seconds I get a notification that the career is over or something. It's so annoying.