Suppose that you have multiple sea units starting in a sea zone which has an enemy submarine in it. (and no other enemy units, hence the sea zone is considered “friendly”)
I think the rules are clear that you can:
- Attack the submarine
- Attack elsewhere as desired
- Split your units to attack the submarine and attack elsewhere
- Ignore the submarine and move during the non-combat move phase as desired
My question is, are you able to attack the submarine with some units and make non-combat moves with the remainder. Or does attacking the submarine mean all units starting in that sea zone have to participate in that combat if not participating in another combat and are therefore disqualified from doing non-combat moves.
Similarly, if you have an unloaded transport starting in the sea zone, what are your options if you do decide to attack the submarine?