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.
Convoys and subs
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Does a sea zone have to be uncontested for a convoy disruption to work? Japan sub beside java (uk owned) uk rolls in a crusier to kill the sub, sub submerges. Does the sub still cause a convoy disruption?
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Does a sea zone have to be uncontested for a convoy disruption to work? Japan sub beside java (uk owned) uk rolls in a crusier to kill the sub, sub submerges. Does the sub still cause a convoy disruption?
A seazone does not need to be uncontested - the simple presence of an enemy ship disrupts the convoy, even if friendly ships are in the same seazone. If the allies has a ship in SZ6 at the mobilize units phase of Japan’s turn, Japan could not prevent the disruption in any way, even if they placed a far numerically superior force. If there’s an enemy ship, it disrupts - end of story.
“Submerging” has no impact on any game phase beyond the combat phase - it is ONLY an ability of the submarine to disengage from the battle and remain in the same seazone. The only time submarines can “submerge” is during combat and after combat is over, submarines are no longer considered submerged. It is simply a retreat mechanism, it does not exist in any manner outside of the conduct combat phase.





