@The_Good_Captain The rule applies in all sea battles where there are sea units allied to the attacker present, regardless of the type(s) of defending German sea units. The rule mentions only German subs because the author failed to take into account the possibility that the situation could also exist with German surface units if they were mobilized in a hostile sea zone. This oversight was corrected in the Axis & Allies Pacific Rulebook.
Convoy and subs withdraw
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There’s Germans subs in a convoy zone and allies try to claim it back. The subs withdraw because the dice failed. And then, what happen with the (ipc) convoy, because there’s unit of both sides in it ?:??
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Submerged subs don’t count as a presence, so the attacker would gain control of the convoy zone.