Well I have read a book that states that Churchill would not proceed with an invasion of France until a Russian victory at Stalingrad. Stalin said he couldn't win at stalingrad until the rest of the allies invaded france forcing hitler to divert his troops.

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"Goddam it, you'll never get the Purple Heart hiding in a foxhole! Follow me!" Captain Henry P. Jim Crowe - 13th January 1943 - (Guadalcanal)