Pearl Harbor: Who Blundered?

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The Hawaiian Department plans provided for three kinds of alert. Number 1, which was what Short had ordered, was to guard against sabotage and uprisings—long a preoccupation of all Hawaiian commanders because of the high proportion of Japanese in the Islands. Number 2 included security against possible isolated, external air or naval attacks. Number 3 was a full-scale deployment for maximum defense of the Islands, and particularly of Oahu—heart of the military organization. Only in the two higher stages of alert was ammunition to be distributed to the antiaircraft batteries; in Alert No. 1 all ammunition was to be kept stored in the dumps. Under Alert No. 1, planes would be parked closely for easy guarding; under the others they would be dispersed.

General Short felt he was confirmed in his concern over sabotage when his intelligence officer—or G-2—presented a message from the War Department G-2, warning that “subversive activities may be expected.”

In obedience to the instruction to make such reconnaissance as he might “deem necessary,” Short did, however, order his newly installed radar stations to operate daily from 4 A.M. to 7 A.M. ; these were the dawn hours when surprise attack was most likely. Further reconnaissance, he felt, was the Navy’s responsibility. He didn’t know that Kimmel was having troubles of his own in attempting any sustained offshore reconnaissance. Nor was Kimmel aware that Short’s radar was operating only on a curtailed basis.

Kimmel pondered over what steps he should take. Though he was already alerted to some extent, he knew that for the moment he could do little in the way of “defensive deployment” in his war plan tasks—most specifically, raids into the Japanese mandated islands. Should he then prepare for an attack against Oahu? The Washington message implied that this was not a probability. Even so, he didn’t have sufficient planes for a 360 degree, distant reconnaissance from Oahu.

In compliance with instructions from Washington, Kimmel was sending some Marine planes to Wake and Midway islands. He decided that the two carrier task forces he was ordering to carry out this instruction could, en route, conduct long-range searches to the west, over the direct route from Japan to Oahu.

Task Force 8, under Vice Admiral William F. Halsey, including the carrier Enterprise and three cruisers, was leaving that day. In conference with Halsey before departure, Kimmel showed him the “war warning” message. Halsey asked how far he should go if he met any Japanese ships while searching. “Use your common sense,” was Kimmel’s reply. Halsey, it is understood, commented that these were the best orders he could receive, adding that if he found as much as one Japanese sampan, he would sink it. Kimmel, by making no further comment, apparently acquiesced.

Pending the arrival of Halsey at Wake, Kimmel sent orders to a patrol plane squadron based on Midway to proceed to Wake and return, searching ocean areas and covering a 525-mile area around Wake itself.

Kimmel felt that he had done all he could in that line without completely halting fleet training and exhausting the pilots of his relatively weak air command. But he did order immediate attack on any and all unidentified submarines discovered in the vicinity of Oahu and other fleet operating zones. Neither then nor later, apparently, did he check on the local security measures undertaken by Admiral Bloch’s command, nor did he suggest any co-ordination between Bloch and Short.

[Nagumo’s force was steady on a course laid between the Aleutians and Midway Island, the carriers in two parallel rows of three each. Battleships and cruisers guarded the flanks, destroyers screened wide, and submarines were scouting far ahead.]

Washington, Friday, November 28

General Marshall, back from his North Carolina inspection, was briefed by Gerow on the previous day’s happenings. He read and approved the joint memorandum, already signed by Admiral Stark, which urged on the President the need for gaining time, particularly until troops—some already at sea and nearing Guam, others about to embark on the West Coast—could reach the Philippines. He also approved the warning message Gerow had sent to the overseas commanders.

At noon he attended the President’s “War Council” meeting at the White House. The implications of a large Japanese amphibious force, known to be sailing southward through the South China Sea, were discussed. British Malaya, the Netherlands East Indies, and the Philippines were potential targets, the invasion of which would immediately involve us in war. But unless Congress should previously declare war, the United States could not attack this force. It was agreed that the President should send a message to Emperor Hirohito urging him to preserve peace, and that Mr. Roosevelt should also address Congress, explaining the dangers being created by this Japanese aggressive action. The President then left for a short vacation at Warm Springs, Georgia, directing his advisers to have the two documents prepared in his absence.