@nolimit said in defending Sub question:
@commander-jeff 2, they retreat to One sz Area wherever any of the Transports came from- also the Units stay on the Transports!
To elaborate on this, the transports may retreat to a sea zone from which any of the original attacking sea units entered, so if the destroyer and/or sub actually entered from a different direction than the transports, that sea zone would also be valid for the retreat.
Also, if none of the sea zones from which any of the attacking units entered were friendly (they all started in enemy-occupied zones) or all of the attacking units were already in the contested sea zone to start with, no retreat would be possible and the transports would be automatically destroyed. Of course, in the latter case the attacking units could combat move out of the sea zone and then back in in order to establish a retreat route, assuming there were an adjacent friendly sea zone.