Interesting concept Neal
I could see that in MP action. It would be fun to play cat and mouse with a few ash cans for good measure.
@ Nisgeis I can plausibly see myself playing a campaign being a destroyer in the Atlantic and not find it dull. The player would have to have an interface that allows that player to direct the other escorts in the group. Sure, there might be a spell were there are no subs looking to sink your appointed vessels but while in the sub you run into a dry spell with no vessels to sink. It is very similar in nature. Imagine a wolfpack along the way! If done right with a great graphics engine I think a large following could be possible and throw in MP action for both subs and DD.