45-1-19 Iwo Jima

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Battle of Iwo Jima - 1945, 19 February - BrMo > .

For seventy two days before the American landings planes had been bombing the heavily fortified base on Iwo Jima. Marines of the 4th and 5th Divisions made the landing under cover from their own ships. Casualties were heavy, two thousand Marines gave their lives in storming the beaches and advancing towards the first of the airstrip.

The Battle of Iwo Jima (19 February – 26 March 1945) was a major battle in which the United States Marine Corps and Navy landed on and eventually captured the island of Iwo Jima from the Imperial Japanese Army (IJA) during World War II. Lying roughly halfway between American Army Airforce bases in the Mariana Islands and the Japanese islands, the military base on Iwo Jima gave the Japanese an ability to send early air raid warnings to the Japanese mainland and launch fighters from its airfields to intercept raids. 

After the American capture of the Marshall Islands, and the devastating air attacks against the Japanese fortress island of Truk Atoll in the Carolines in January 1944, the Japanese military leaders reevaluated their situation. All indications pointed to an American drive toward the Mariana Islands and the Carolines. 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, and thence to Japan via the Volcano Islands, and westward from the Marianas via the Carolines and the Palau Islands to the Philippines.

In March 1944, the Japanese 31st Army, commanded by General Hideyoshi Obata, was activated to garrison this inner line. (Note that a Japanese army was about the size of an American, British Army, or Canadian Army corps. The Japanese Army had many armies, but the U.S. Army only had ten at its peak, with the 4th Army, the 6th Army, the 8th Army, and the 10th Army being in the Pacific Theater. Also, the 10th Army only fought on Okinawa in the spring of 1945.)

The American invasion, designated Operation Detachment, had the purpose of capturing the island with its two airfields: South Field and Central Field. The strategic objectives were twofold: the first was to provide an emergency landing strip for battle-damaged B-29s unable to make it back to US air bases in the Marianas Tinian, Saipan, Guam. The second was to provide air fields for fighter escorts, long-range P-51s, to provide fighter coverage to the bombers. The five-week battle saw some of the fiercest and bloodiest fighting of the Pacific War.

The IJA positions on the island were heavily fortified, with a dense network of bunkers, hidden artillery positions, and 18 km (11 mi) of tunnels. The American ground forces were supported by extensive naval artillery, and had complete air supremacy provided by U.S. Navy and Marine Corps aviators throughout the battle.

Japanese combat deaths numbered three times the number of American deaths although, uniquely among Pacific War Marine battles, American total casualties (dead and wounded) exceeded those of the Japanese. Of the 21,000 Japanese soldiers on Iwo Jima at the beginning of the battle, only 216 were taken prisoner, some of whom were captured because they had been knocked unconscious or otherwise disabled. The majority of the remainder were killed in action, although it has been estimated that as many as 3,000 continued to resist within the various cave systems for many days afterwards, eventually succumbing to their injuries or surrendering weeks later.

The last of these holdouts on the island, two of Lieutenant Toshihiko Ohno's men, Yamakage Kufuku (山蔭光福, Yamakage Koufuku) and Matsudo Linsoki (松戸利喜夫, Matsudo Rikio), lasted four years without being caught and finally surrendered on 6 January 1949.

Though ultimately victorious, the American victory at Iwo Jima had come at a terrible price. According to the official Navy Department Library website, "The 36-day (Iwo Jima) assault resulted in more than 26,000 American casualties, including 6,800 dead." By comparison, the much larger scale 82-day Battle of Okinawa lasting from early April until mid-June 1945 (involving five U.S. Army and two Marine Corps divisions) resulted in over 62,000 U.S. casualties, of whom over 12,000 were killed or missing. Iwo Jima was also the only U.S. Marine battle where the American casualties exceeded the Japanese, although Japanese combat deaths numbered three times as many as American deaths. Two US Marines were captured during the battle, neither of whom survived their captivity. The USS Bismarck Sea was also lost, the last U.S. aircraft carrier sunk in WW2. Because all civilians had been evacuated, there were no civilian casualties at Iwo Jima, unlike at Saipan and Okinawa.

In hindsight, given the number of casualties, the necessity and long-term significance of the island's capture to the outcome of the war became a contentious issue and remains disputed. The Marines, who suffered the actual casualties, were not consulted in the planning of the operation. As early as April 1945, retired Chief of Naval Operations William V. Pratt stated in Newsweek magazine that considering the "expenditure of manpower to acquire a small, God-forsaken island, useless to the Army as a staging base and useless to the Navy as a fleet base ... [one] wonders if the same sort of airbase could not have been reached by acquiring other strategic localities at lower cost."

The lessons learned on Iwo Jima served as guidelines for the following Battle of Okinawa and the planned invasion of the Japanese homeland. For example, "because of the casualties taken at Iwo Jima on the first day, it was decided to make the preparatory bombardment the heaviest yet delivered on to a Pacific island". Also, in the planning for a potential attack on the Japanese home islands, it was taken into account that around a third of the troops committed to Iwo Jima and again at Okinawa had been killed or wounded.

The justification for Iwo Jima's strategic importance to the United States' war effort has been that it provided a landing and refueling site for long-range fighter escorts. These escorts proved both impractical and unnecessary, and only ten such missions were ever flown from Iwo Jima. By the time Iwo Jima had been captured, the bombing campaign against Japan had switched from daylight precision bombing to nighttime incendiary attacks, so fighter escorts were of limited utility.

Joe Rosenthal's Associated Press photograph of the raising of the U.S. flag on top of the 169 m (554 ft) Mount Suribachi by six U.S. Marines became an iconic image of the battle and the American war effort in the Pacific.