Sea units starting in hostile sea zones
For Example Japan and the US are not at war.
Different surface warships of both sides are sharing a seazone.
Now Japan declares war on the US.
Is it possible to leave some ships/planes in the hostile sea zone for combat and move with the others ships/planes outside?
(For example leaving the planes in the sea zone and move the CV away)
Or have they all to leave at once?
You can split them in any way that you like, including all staying or all going. However, if any units stay, at least one of them must have an attack value greater than zero.
There will be a few “Zeros” in the seazone, but with an attak of 3 or less.