The Germans have no destroyer present, therefore the defending air units can not hit the sub, and of course the sub can never hit planes. Think of it in terms of the combined arms rule, air units can only hit subs if they are combined with at least 1 participating destroyer, the difference with this particular combined arms is that it works while attacking and defending. In the scenario that you described, the sub would destroy the remaining transport without rolling and the defending fighters can do nothing.
Sub question
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Sorry if this has been addressed before, I looked but couldn’t find anything on it.
A German sub is convoy raiding sz 119, it is attacked by a British sub. The Brit misses, the German submerges. Is the German sub still considered to be convoy raiding or is that negated by the fact that he submerged? -
Submerging only removes a sub from combat. It has no further effect beyond that, so the sub will still raid the convoy.
By the way, submerging occurs before any dice are rolled by either side, so the German sub could submerge before the UK sub could fire. The only way that you can attack a sub is if either it wants to fight or you bring a destroyer to keep it from submerging.
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House rule: Submarines fire at 2 on defense if there is no enemy destroyer present…?