December 2, 1941
Today in World War II Pacific History
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Tuesday, 2 December 1941

IJN: The coded signal "Niitakayama Nobore 1208" (Climb Mt. Niitaka1208) is transmitted to all units and vessels of the Imperial Japanese Navy. Niitakayama (Mount Niitaka) on Formosa (Taiwan) is the highest peak in the Empire of Japan. After receiving this signal, warships and carriers opened sealed top secret orders indicating hostilities will commence against the Allies on December 8, 1941. Across the International Date Line, the Hawaii Operation would commence in the morning of December 7, 1941 against Pearl Harbor and Oahu in the Territory of Hawaii (Hawaii) in the United States.

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