Citabria, the way Dale described it to me, there would be a "wolf pack" object akin to a AH task group. You would maneuver it the same way as fleets, i.e. with waypoints. Then, when it was in position, you would spawn subs from the wolf pack, just like PT boats are spawned from fleets. That, at least, was the original concept as I understood it. There are of course many questions that would need answering, such as how do you "sink" a wolf pack so that it can not spawn any more U-boats? Will fleets have automatic ASW defenses, as well as player-controlled ones?