I read a book called 'Citadel'. It was amazing that with the Russians knowing all about it from it's conception and their huge defensive build up in the area, that Hitler continued it....even when he expressed doubts about it himself.
Guderian even asked Hitler. "Why would you even want to attack in the East this year?" Hitler replied "I don't want to, the thought of it turns my stomach, but we have to do something."
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