Why Weren't We Warned?

Military History Quarterly, Autumn 1991, volume 6 #1: The article says that code-breaking can give the U.S. an idea of what is going on but doesn't help much in trying to figure out how the Japanese were actually thinking. The article that talks about the cipher bureau, and how they had 50 to 75 intercepts solved daily.

The problem with Pearl Harbor, though, was that there were no specific Japanese messages that could have been decoded that would have time just when they were planning to attack the base.



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