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.
Taranto question
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True, I did not mean to say that one bad-luck battle increases your odds of a future good-luck battle. What I meant is that Global 1940 is a much bigger game than, say, Revised. Global has more units involved and more battles that matter. The effect of having more units and more battles is to soften the effect of any one unit missing or of any one battle going poorly. In other words, as you broaden your sample size, you get closer to achieving average results in the aggregate.





