I've never had any problems when I COULD engage them (too rough seas usually) but when I DO go after them with the deck gun (often when reloading torpedos) it usually takes 1 shot and they run with their tail between their legs, they dont get far though as I'm proud to say I'm a fairly good shot with the DG and almost always sink em.

you do NOT shoot holes in MY boot you silly english pig-dogs!
lol