@The-Captain Wow. I think one of the effects could be UK having to be even more aware of Home Defense at least until the Yanks get into the fight.
Intelligence
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Has anyone ever incorporated intelligence into global 1940? US and British code breakers played a huge role in the war. Also, soviets were able to move troops from Siberia because they knew the Japanese weren’t going to attack them. Just curious, thanks.
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Hard to simulate with no fog of war, perhaps the UK and US can use the intelligence to fortify defenses in anticipation of an attack. Maybe a pre-emptive roll or two of 3 or less to start each defensive battle?