Generally speaking powers defend together. However in G40 there are powers that start off neutral (Russia and USA) or not at war with each other (like Japan and UK/France). You could have a case at sea when you attack a sz with units from multiple powers, and can ignore the units that belong to a power that you aren’t yet at war with.
Multi-National Question
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I’m 90% sure I know, but need to clearify. When conducting bombardment for Battleships/Cruisers. Do I also count friendly Cruisers/Battleships?
Example, U.S. moves in a sea zone with 1 battleship, unloads 2 inf. on hostile island, this sea zone already has a U.K battleship present. So Instead of firing 1 bombardment, I’d fire 2.
As I said, 90% sure the answer is ‘No, only fire for the U.S. since it’s their turn’. Just wanted to make sure.
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You are correct–friendly ships belonging to other powers that are in the same SZ as an amphib assault do not fire during the attack.