Events Leading To The Attack On Pearl Harbor - Breaking Off Negotiations

Breaking Off Negotiations

Part of the Japanese plan for the attack included breaking off negotiations with the United States 30 minutes before the attack began. Diplomats from the Japanese Embassy in Washington, including the Japanese ambassador, Admiral Kichisaburō Nomura, and special representative Saburō Kurusu, had been conducting extended talks with the State Department regarding the U.S. reactions to the Japanese move into Việt Nam in the summer.

In the days before the attack, a long 14-part message was sent to the Embassy from the Foreign Office in Tokyo (encrypted with the Type 97 cryptographic machine, in a cipher named by U.S. cryptanalysts), with instructions to deliver it to Secretary of State Cordell Hull at 1 p.m. Washington time. The last part arrived late Saturday night (Washington time) but due to decryption and typing delays, and to Tokyo's failure to stress the crucial necessity of the timing, Embassy personnel did not deliver the message breaking off negotiations to Secretary Hull until several hours after the attack.

The United States had decrypted the 14th part well before the Japanese Embassy managed to, and long before the Embassy managed a fair typed copy. The final part, with its instruction for the time of delivery, had been decoded that night, but was not actioned until the next morning; according to Clausen, who also denied the claim by Bratton that General Marshall couldn't be found (as he was out for a morning horseback ride).

It prompted General George Marshall, Army Chief of Staff, to send that morning's warning message, with assurances that it would be received by all recipients by 1 pm Washington time. There were delays in the message sent to Hawaii because of trouble with the Army's long distance communication system, a decision not to use the Navy's parallel facilities despite an offer to permit it, and various troubles during its travels over commercial cable facilities (somehow its "urgent" marking was misplaced, adding additional hours to its travel time). It was actually delivered to General Walter Short, by a young Japanese-American cycle messenger, several hours after the attack had ended.

The Japanese Ambassador asked for an appointment to see the Secretary at 1:00 p.m., but later telephoned and asked that the appointment be postponed to 1:45 as the Ambassador was not quite ready. The Ambassador and Mr. Kurusu arrived at the Department at 2:05 p.m. and were received by the Secretary at 2:20. The Japanese Ambassador stated that he had been instructed to deliver at 1:00 p.m. the document which he handed the Secretary, but that he was sorry that he had been delayed owing to the need of more time to decode the message. The Secretary asked why he had specified one o'clock. The Ambassador replied that he did not know but that that was his instruction. After the Secretary had read two or three pages he asked the Ambassador whether this document was presented under instructions of the Japanese Government. The Ambassador replied that it was. The Secretary as soon as he had finished reading the document turned to the Japanese Ambassador and said:

I must say that in all my conversations with you (the Japanese Ambassador) during the last nine months I have never uttered one word of untruth. This is borne out absolutely by the record. In all my fifty years of public service I have never seen a document that was more crowded with infamous falsehoods and distortions--infamous falsehoods and distortions on a scale so huge that I never imagined until today that any Government on this planet was capable of uttering them.

The Ambassador and Mr. Kurusu then took their leave without making any comment.

There were Japanese records, admitted into evidence during Congressional hearings on the attack after the War, that established that the Japanese government had not even written a declaration of war until hearing news of the successful attack. The two-line declaration of war was finally delivered to U.S. Ambassador Grew in Tokyo about 10 hours after the attack was over. He was allowed to transmit it to the United States where it was received late Monday afternoon (Washington time).