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Edited on Tue Dec-02-08 12:19 AM by Forkboy
I've read about the intercepted telegraphs. If I remember correctly Gen George Marshall held a closed meeting with members of the press around Nov 14th or 15th in which he announced that they had broken the Japanese codes. He also predicted an attack in the first 10 days of December. It wasn't made public, which is what I think has led to much of the conspiracy stuff surrounding them. However, it makes perfect sense to not announce it, as doing so lets the Japanese know they need to change their codes, not something you want to do.
On the 25th of Novmeber the US Navy detected movement of the Japanese Naval Fleet led by the Yamamoto. The fleet had a screen of submarines and that was what was detected, but the destination was thought to be the Marshall Islands and South East Asia.
On the 27th the whole US Pacific Fleet was put on war alert. The next day SoS Hull sent another secret message warning of a possible attack.
After a bad storm separated much of the Japanese fleet, on the 30th US radio intercepted a message from the Pearl Harbor Attack Force ship the Akagi calling his ships to reform.
On Dec 1, FDR was given 4 "Purple" intercepts, one from the 28th of Nov saying that US-Japan negotiations were about to end...abruptly (the negotiations had been over the topic of Japan's presence in China). The same day Japan changed all their codes.
On Dec 6th the Army and Navy both decrypted the Japanese war plans, and these 13 missives were brought to FDR, at which point he supposedly said the famous words, "This means war!" But there was no destination in the war plans. The 14th part was missing.
Late that night another dispatch was intercepted that said "X-Day" was Dec 8th, Tokyo time, which was Dec 7th for us still. This message wouldn't be deciphered for two days though, a day after the attack.
I may be off on a day or two here, but from this timeline it's hard to see how FDR could have known anything solid enough to really act upon to stop the attack.
And don't worry about reading conspiracy theories and such. I do all the time, with a very skeptical eye, but enough so-called conspiracy theories have been proven correct that keeping an eye on them isn't a bad thing. I just feel in this case it's a wrong theory.
As I said though, I could be wrong. :)
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