@Crazy:
So, with the D-Day N A, would the DD from the UK partake in the melee with the Bmr on the U-Boat, or just keep it from getting away under the waves?
I believe in Joint Strike (LHTR name for D-day), the US commandeers (takes control) of all UK units and they act as one force.
In this case, the DD WOULD attack the sub as well as prevent the sub submersion.