Note 5 — Chapter I · The Strategic Plan

In 1942 and 1943 the Allied forces had halted the Japanese at Papua and Guadalcanal and started to push them back. On 8 May 1943 the Joint Chiefs approved a “Strategic Plan for the Defeat of Japan,” which was endorsed by the Combined Chiefs in December. The objective of the plan was to secure the unconditional surrender of Japan, an objective that might necessitate an invasion of the Japanese home islands. As such an invasion promised to be a “vast undertaking,” it would be necessary to secure a large supply base from which a great aerial offensive could be mounted against Japan. According to the original plan this base was to be located in China, but the Mariana Islands were afterward substituted for China. The plan called for the acquisition of successive island bases which could be used as “steppingstones,” preferably those which would shorten the sea route, provide for its security, and at the same time deny to the Japanese bases from which they might interfere with the Allied line of communications. The main effort was to be through the waters of the Pacific Ocean. Nimitz’ operations were to be conducted west through the Japanese mandated islands while MacArthur’s proceeded northwest along the New Guinea coast. The two series of operations were to be mutually supporting.5