ラッセル・グレンフェル英国海軍大佐
There is so much evidence of official warnings to American Service commanders to be prepared for surprise attack that the expectation of such attack is established beyond question. For example, there is Admiral Stark's 'war warning' signal of November 27th to the American Navy that 'an aggressive move by Japan is expected within the next few days'. Moreover, the sighting of the Japanese convoys off Camo Point on December 6th (or nearly two days before the attack on Pearl Harbor) was known in Manila the same day, and presumably was also known in Washington. The American authorities must therefore have been aware that Japan was on the move and about to attack somewhere. What seems never to have crossed their minds was that the attack would come at Pearl Harbor. But a miscalculation of this kind was hardly the fault of the Japanese; especially as the American Ambassador in Japan had previously warned Washington that this very attack was being freely rumored in Tokyo.
Main Fleet To Singapore : Captain Russell Grenfell（107ページ）
（拙訳。参考として）
奇襲攻撃に備えよ、と米軍の指揮官に宛てて警告がなされていた証拠はたくさんあるのであり、そのような攻撃が間違いなく策定されている、と予期されていた。たとえば「数日のうちに、日本による攻撃的な行動があると予想される」という、スターク提督から米海軍への、11月27日付の「警告」がある。さらに、12月6日（真珠湾攻撃のほぼ2日前）、カモー岬沖で日本の護送船団が目撃され、マニラでは同日中に知られていた。そしてワシントンでも知られていただろう。したがって、日本が活動的であり、どこかを攻撃しようとしていることを、米国当局は認識していたはずだ。攻撃が真珠湾に来るということを、彼らの脳裏をかすめたことはないようだ。このような判断ミスは日本の責任ではなかった。特に米国の駐日大使は、前もって、まさしくこの攻撃が東京で自由に噂されていることを、ワシントンに警告していた。
TOKYO, January 27, 1941-6 p.m.
[Received January 27-6: 38 a.m.]
125. A member of the Embassy was told by my ------- colleague that from many quarters, including a Japanese one, he had heard that a surprise mass attack on Pearl Harbor was planned by the Japanese military forces, in case of "trouble" between Japan and the United States; that the attack would involve the use of all the Japanese military facilities. My colleague said that he was prompted to pass this on because it had come to him from many sources, although the plan seemed fantastic.
GREW
Papers relating to the foreign relations of the United States. Japan: 1931-1941. V.2. p.133
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