Pearl Harbor Timeline

United States imposed trade sanctions, then embargo, trying to slow Japan's military aggression

Admiral Yamamoto communicates with Japanese officers about Pearl Harbor attack.

Admiral Husband E. Kimmel is takes over command of U. S. Pacific Fleet in Hawaii.

United States intelligence officers monitor Japanese secret communications.

Japanese Admiral Nomura informs his superiors that U. S. has been reading messages. Noone believed the code could be broken and was not changed.

Admiral Yamamoto trains military and plans for Pearl Harbor attack.

Bomb plot message from Japanese naval intellifence to Japan's consul in Honolulu requested locations of U. S. ships in Pearl Harbor.

Diplomat from Tokyo comes to Washington to seek a diplomatic solution. Japan wants the U.S. to agree to its Southern expansion in Asia. U. S. did not agree and Japan wa prepared for a war.

War Warning received from Washington informing of a Japanese attack with a possible American target in the Pacific.