Japanese air attacks on the Mariana Islands and anti-aircraft guns shot down about 37 Japanese aircraft during these raids. After the Marianas began to come under attack, the United States military stepped up its raids on the Japanese-held islands which could be used to launch raids on the B-29 bases. Particular attention was given to Iwo Jima, as it was correctly assumed that the Japanese aircraft which attacked the Marianas were flying from Japan and staging through the island en route to their targets. Following the first raid against Saipan in November, XXI Bomber Command B-29s were dispatched against Iwo Jima's airfields on November 5 and 8.
Imperial Japanese Navy in World War II Marshall Islands, and the Bismarcks as vital areas to be defended. They then based their possible actions on the defense of an inner perimeter, which included the Marianas, Palau, western New Guinea, and the Dutch East Indies. Meanwhile, in the Central Pacific a major American offensive was initiated, beginning in November 1943 with landings in the Gilbert Islands. The Japanese were forced to watch helplessly as their garrisons in the Gilberts and then the Marshalls were crushed. The Japanese strategy of holding overextended island garrisons was fully exposed. In February 1944, the US Navy's fast carrier task force attacked the