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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The Italians and Germans have fleets off the coast of DC. USA builds 6 subs. This forces Italy to either move away or stay and attack USA on Italy’s turn. Germany does not participate in the battle when Italy “attacks” USA (by not moving away). Italy does not have any destroyers. Germany has 2 destroyers. Can the USA submarines submerge and retreat after the first round of combat?
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The Italians and Germans have fleets off the coast of DC. USA builds 6 subs. This forces Italy to either move away or stay and attack USA on Italy’s turn. Germany does not participate in the battle when Italy “attacks” USA (by not moving away). Italy does not have any destroyers. Germany has 2 destroyers. Can the USA submarines submerge and retreat after the first round of combat?
If Italy has no destroyers, the US subs can submerge before the Italians can even fire a shot.
However, Italy is not obligated to attack subs alone, and can also choose to ignore them and move during the noncombat phase if they wish.
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Thanks very much.





