Yes, Panther is correct. An important additional note is that the attacking transports may not unload during non-combat. Anything that is on board stays on board and remains vulnerable to sinking.
Sorry about that…I don’t know what I was thinking when I posted. The dd would obviously cancel the sub’s special abilities. Thanks for the clarification and reminder.
No, all combat movement must be completed before any combat begins. The declaration of an amphibious assault with a preceeding naval battle is the only exception.