Lets say Germany attacks sea zone #109 (1 UK destroyer and 1 Transport) during their first turn. He brings in 2 submarines and 2 fighters, and the Allies scramble 3 defending fighters into the adjacent sea zone battle.
My submarines hit once and my fighters hit once, the UK destroyer misses and the fighters hit twice.
Who must remove their casualties first, the attacker or the defender?
The UK defender removes 1 destroyer (mandatory due to the sub hit) and 1 fighter, the German attacker removes 1 submarine and 1 fighter, than retreats leaving only a German submarine and a British transport in sea zone #9. Seeing as the scrambled planes can’t fire at the German sub due to the lack of a destroyer present, can the remaining sub can hit the defenseless transport or must it also retreat when the aircraft do?