But once it arose it never hesitated to dare to do the most difficult thing on this earth. Oh, how powerful is the Imperial Navy! Commander Sanagi SadamuOperations Section, Japanese Naval StaffDiary entry for 8 December 1941 Kimmel was unaware of it, as was Short, as was every other commander or senior staffer in the two services who was capable of doing anything about it, but one of the Army’s mobile radar (AWS) stations picked up the incoming Japanese air fleet and reported it to the Army’s Information Center at Fort Shafter. On 7 December, the six radar stations positioned around Oahu shut down operations at 0700, which was just over a half hour after sunrise, the predicted danger period.1 There is no document found by this writer to indicate that the Japanese knew that General Short’s radar stations stood down at that hour on Sundays, or that they even knew that Oahu was equipped with this detection technology. Even Kimmel did not know that Short’s radar screens went dark on schedule at 0700 that morning.2 It was only luck, it appears, that led the Japanese aircraft to approach the island just “over”
