Pearl Harbor: Who Blundered?

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Kimmel felt that these steps would ensure a reconnaissance search of a large portion of the central Pacific Ocean, as extensive as his limited aircraft strength would permit. But, from the Hawaiian Islands north to the Aleutians, both sea and air were still bare of American reconnaissance.

Kimmel and Short did not meet that day.

[Admiral Nagumo, watching the intermittent refueling being carried on during the day, was intrigued to learn from Honolulu, via Tokyo, that watchful Japanese eyes were “unable to ascertain whether air alert had been issued. There are no indications of sea alert.…”]

Washington, Friday, December 5

Both War and Navy departments were busy compiling data for President Roosevelt on Japanese sea, land, and air strength concentrating in French Indochina and adjacent areas. In an intercepted Japanese message from Washington, Ambassador Nomura told Tokyo that in case of Japanese invasion of Thailand, joint military action by Great Britain and the United States “is a definite certainty, with or without a declaration of war.” Another, from Tokyo, reiterated the previous instructions about destruction of codes and coding machines.

Admiral Stark, conferring with staff officers, decided no further warning orders need be sent to overseas naval commanders; the message of November 27 was adequate. All concurred.

Honolulu, Friday, December 5

General Short read with interest a cryptic message from G-2 in Washington to his intelligence officer, directing him to get in touch with the Navy immediately “regarding broadcasts from Tokyo reference weather.” So Lieutenant Colonel George W. Bicknell, assistant G-2, gave the General all facts obtainable from his own office and from Kimmel's headquarters. Short was informed by Kimmel of the departure of the two naval task forces of Admirals Brown and Newton.

[While pilots and squadron leaders on board Nagumo’s fleet studied and restudied their coming roles, the ships —900 miles north of Midway and 1,300 miles northwest of Oahu—slid slowly down the North Pacific rollers, still far beyond the range of any American search plane.]

Washington, Saturday, December 6

Reports of increasing Japanese concentration and movements in Indochina, South China, and the South China Sea absorbed Stark and Marshall, as well as all the other members of the War Cabinet from the President down. Mr. Roosevelt, the service chiefs were glad to learn, had decided that he would personally warn Emperor Hirohito that further aggressions might lead to war and urge the Japanese ruler that withdrawal of his forces from Indochina “would result in the assurance of peace throughout the whole of the South Pacific area.”

Late in the afternoon Magic plucked out of the air thirteen parts of a fourteen-part memorandum from Tokyo to the Japanese envoys. This much of the message summarized negotiations from the Japanese viewpoint, concluding that the American note of November 26 was not “a basis of negotiations.” The envoys were instructed to handle it carefully, since “the situation is extremely delicate.”

Distribution of this intercept was curious. Decoding was completed after office hours. General Sherman A. Miles, Army G-2, saw no need to disturb either the Secretary of War, General Marshall, or General Gerow at their homes. (In passing it might be mentioned that one didn’t disturb General Marshall at home without extremely good reason.) Some Navy people saw the message. Stark, who was at the theater, learned of it when he returned home and found that he was expected to call the White House. The President had received the intercept, as had the State Department. The details of the conversation are not known, but presumably the President told Stark, as he had earlier said to Harry Hopkins: “This means war!”

Honolulu, Saturday, December 6

In the daily radio intelligence summary received that morning from Washington, Admiral Kimmel was again struck by lack of information on the location of Japanese carriers. In other dispatches, however, there was considerable information about different kinds of Japanese activity. He received a copy of Admiral Hart’s message reporting on the movement of the two convoys south of Indochina. And he received a message from Washington authorizing him, “in view of the international situation and the exposed position of our outlying Pacific Islands,” to order the destruction of classified documents at these islands, “now or under later conditions of greater emergency.” Neither the Admiral nor any member of his staff saw any need to pass on any information to the Army. Presumably General Short was getting it all through Army channels.