@Hepps Ah ok. No idea, then, how the transports would be captured. I guess you are thinking about another feature for that.
Actually, in pre-industrial times all kind of ships were usually captured, more or less damaged, and rarely sunk, even after the advent of firepower. A marginal exception would be a limited timeline in Greek history, were ramming was especially effective.
Anyways, regarding what I said before, I would have to test the case of infrastructure transports against infrastructure transports only. In land territories, what happens in the case of infrastructures vs infrastructures only is that the attacking infrastructures conquer the territory (and any defending infrastructures (that are not defending alone)), if the battle would start with infrastructures only in defence (but what happens is that TripleA incorrectly captures the territory during Combat Movement). On the other hand, the attacking infrastructures are conquered, if the battle starts with some non infrastructures in defence (and, at some point, during the battle, only attacking infrastructures are left, no matter if the defender got nothing or only infrastructures too, at this point). This appears to be self inconsistent and contradictory (under substantially the same situation, of infrastructures vs infrastructures only, the defender is captured if combat didn't start, while the attacker is captured if this same condition happens at the end of some combat round).