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As a strategic blow intended to prevent American interference in the Dutch East Indies for six months, the Pearl Harbor attack was a success, but unbeknownst to Yamamoto, it was a pointless one. In 1935, in keeping with the evolution of War Plan Orange, the United States Navy had abandoned any notion of charging across the Pacific towards the Philippines at the outset of a war with Japan. In 1937, the United States had further determined even fully manning the fleet to wartime levels could not be accomplished in less than six months, and the extensive logistical support required to advance across the Pacific simply did not exist and would require two years to construct.