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In page Battle of Iwo Jima:

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After the American capture of the Marshall Islands and the air attacks against the Japanese fortress island of Truk Atoll in the Carolines in January 1944, Japanese military leaders reevaluated their strategic position. All indications pointed to an American drive toward the Mariana Islands and the Carolines.[citation needed] To counter such an offensive, the IJA and the Imperial Japanese Navy (IJN) established an inner line of defenses extending generally northward from the Carolines to the Marianas, from there to Japan via the Volcano Islands, and westward from the Marianas via the Carolines and the Palau Islands to the Philippines.[citation needed]