I'm looking for a book that is at least 20 years old.

A group of people travel back in time to WWII. They try to change the course of the war and ultimately succeed, however in the end it is revealed that they were actually in an alternate reality, and not changing history at all.


I'm pretty sure the novel you're looking for is The Proteus Operation by James P. Hogan. I haven't read it in a quite some time but, from what I remember, it fits your description perfectly.

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