Pearl Harbor: Who Blundered?

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And so Oahu drifted into another weekend: a time of relaxation for both Army and Navy. Short, however, was interrupted by Bicknell early that evening at his quarters while he and his G-2—Colonel Kendall Fielder —and their wives were about to drive to a dinner dance.

Bicknell, with some sense of urgency, reported that the local FBI agent had passed to him and to Navy intelligence a transcript of a suspicious long-distance telephone message. A Japanese named Mori, talking to someone in Tokyo, mentioned flights of airplanes, searchlights, and the number of ships in Pearl Harbor, along with cryptic reference to various flowers—apparently part of some sort of code.

Both the FBI man and Bicknell were alarmed at the implications of this flower code. Neither Short nor Fielder, however, was disturbed. Short, before they hurried to the car where their wives awaited them impatiently, told Bicknell he was, perhaps, “too intelligence-conscious.” In any event they could talk about it again in the morning.

The district intelligence officer of the Navy decided that the transcript should be studied further by a Japanese linguist and so put the FBI report away until Monday morning. Admiral Kimmel was not informed.

[Nagumo’s fleet, the wallowing tankers now left behind, was churning southward at twenty-four-knot speed. By 6 A.M. next day it would be 230 miles north of Oahu with its planes thrusting skyward. And at dawn, five midget two-man submarines—disgorged from five large Japanese submarines gathered offshore that night—poked their way around Diamond Head, Pearl Harbor-bound.]

Washington, Sunday, December 7

By 8 A.M. the last part of the Japanese memorandum—Part Fourteen—had been intercepted, transcribed, and was ready for distribution. Both Army and Navy intelligence officers were slightly surprised at its mild tone: “The Japanese Government regrets…that it is impossible to reach an agreement through further negotiations.”

Stark got it in his office. Marshall was taking his Sunday morning recreational ride at Fort Myer: the message would await his arrival—usually at about 11 A.M. All others concerned got it. Meanwhile two other messages had been intercepted by Magic, and Colonel Rufus Bratton, executive officer in G-2, was so upset by them he tried vainly to get them to the Chief of Staff.

One of the messages ordered the embassy to destroy immediately its one remaining cipher machine plus all codes and secret documents. The other read:

“Will the Ambassador please submit to the United States Government (if possible to the Secretary of State) our reply to the United States at 1 P.M. on the 7th, your time.”

It will be remembered that General Marshall did not take kindly to interruptions in his off-duty hours. So, despite the limited area of his ride—an automobile or motorcycle from Fort Myer headquarters could have intercepted him in fifteen minutes at most—not until his return to his quarters at ten-thirty did Marshall learn that an important message was awaiting him. He reached his office in the Munitions Building at about 11:15, to find General Gerow, General Miles, and Colonel Bratton there. Bratton handed him the three intercepted messages—the memorandum, the instructions to destroy codes and papers, and the instruction to deliver the Japanese answer at 1 P.M. precisely.

Marshall read quickly but carefully, as was usual with him. Then—

“Something is going to happen at one o’clock,” he told the officers. “When they specified a day, that of course had significance, but not comparable to an hour.”

He immediately called Stark, who had read all three messages. A warning should be sent at once to all Pacific commanders, Marshall felt. Stark hesitated; he felt all had already been alerted. Marshall stated that in view of the “one o’clock” item he would apprise Army commanders anyway.

Hanging up, he reached for a pencil and drafted his instruction to DeWitt, Western Defense Command; Andrews, Panama Command; Short, Hawaiian Command; and MacArthur, Philippine Command. It took him about three minutes. He read it to the group:

“The Japanese are presenting at 1 P.M. E.S.T. today, what amounts to an ultimatum. Also they are under orders to destroy their code machine immediately. Just what significance the hour set may have, we do not know, but be on alert accordingly.”