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| Invasion of Iwo Jima | |
|---|---|
| Conflict | Battle for Iwo Jima |
| Partof | Pacific Theater of World War II |
| Date | 19 February – 26 March 1945 |
| Place | Iwo Jima, Ogasawara Islands, Bonin Islands, Japan |
| Result | Allied victory |
| Combatant1 | United States (United States Marine Corps, United States Navy, United States Army Air Forces) |
| Combatant2 | Empire of Japan (Imperial Japanese Army, Imperial Japanese Navy) |
| Commander1 | Chester W. Nimitz, Holland M. Smith, Harry Schmidt, Ralph Smith, Toland? |
| Commander2 | Tadamichi Kuribayashi |
| Strength1 | ~70,000 personnel, ~750 ships, ~1,800 aircraft |
| Strength2 | ~21,000 personnel, extensive fortifications |
Invasion of Iwo Jima The Battle for Iwo Jima was a major amphibious assault during World War II in the Pacific, fought between United States Marine Corps and Imperial Japanese Army forces over the volcanic island of Iwo Jima in February–March 1945. The operation aimed to capture Japanese airfields to support B-29 Superfortress operations from bases in the Marianas Islands and to provide emergency landing sites for United States Army Air Forces bombers. The battle became notable for intense fortifications, heavy casualties, and iconic imagery that influenced public perception of the Pacific War.
By late 1944 strategic planning by Admiral Chester W. Nimitz and theater staffs placed Iwo Jima on the route for the United States island-hopping campaign toward the Japanese Home Islands. Iwo Jima lay roughly midway between the Marianas Islands—including Saipan, Tinian, and Guam—and the Japanese mainland, hosting airfields used by Imperial Japanese Army Air Service units and early-warning installations for Imperial Japanese Navy forces. The capture of Iwo Jima was proposed to facilitate fighter escort and emergency landings for 20th Air Force B-29 Superfortress missions originating from Islands of the North Pacific. Japanese strategic leadership including the Imperial General Headquarters and commanders such as Tadamichi Kuribayashi prepared the island as a linchpin in the Defense of the Philippines and later defensive lines.
The United States Pacific Fleet and United States Fifth Fleet allocated an amphibious task force comprising elements of the United States Marine Corps, naval bombardment groups, and carrier-based aircraft from Ninth Air Force and United States Navy Task Force 58 carriers. Commanders included Holland M. Smith (Marine Forces) and Harry Schmidt (V Amphibious Corps), coordinating divisions such as the 3rd Marine Division and 4th Marine Division as well as units from the 147th Infantry Regiment and United States Army service detachments. Naval gunfire support came from battleships and cruisers of the Pacific Fleet, while carrier air support involved squadrons from USS Enterprise (CV-6), USS Essex (CV-9), and other fleet carriers.
Japanese preparations were directed by Tadamichi Kuribayashi and staff from the Imperial Japanese Army 109th Division and local Garrison elements. Kuribayashi emphasized underground defenses, extensive tunnel networks, interlocking artillery positions, and emplaced Type 92 Heavy Machine Gun positions rather than relying on coastal beach defenses favored in earlier engagements. Fortification work used volcanic rock and engineered bunkers connected to caves and shaft systems that reduced the effectiveness of preliminary naval bombardment.
The assault began with an intense pre-invasion bombardment by United States Navy battleships, cruisers, and carrier aircraft in mid-February 1945, followed by amphibious landings on 19 February by elements of the V Amphibious Corps and Marine divisions from LVT and landing craft. Early phases saw heavy resistance on the black-sand beaches near Mount Suribachi and inland from Airfield No. 1 and Airfield No. 2, with Japanese defenders employing tunnels, pillboxes, and close-quarters counterattacks. Fighting developed into protracted attritional combat across ridgelines, lava flows, and fortified positions, including a determined campaign to capture Mount Suribachi culminating in its occupation and the raising of the United States flag—an event widely reported in United States press and captured by photographer Joe Rosenthal.
Subsequent phases shifted to clearing remaining defensive sectors, reducing pocketed positions such as the heavily defended central plateau and the complex around Airfield No. 2 and Airfield No. 3, with combined-arms tactics integrating infantry, armor, close air support, naval gunfire, and flamethrower units. Japanese forces, constrained by supply shortages and orders to resist to the last, launched counterattacks and conducted banzai charges but increasingly withdrew into subterranean positions. The campaign concluded in late March when isolated survivors emerged or were killed, with organized resistance effectively ended.
United States casualties were substantial, including thousands killed and wounded among United States Marine Corps units and supporting United States Navy and United States Army personnel; amphibious ship losses and aircraft losses occurred during the operation. Japanese losses were nearly total for combatants committed to the island; most of the approximately 21,000 defenders were killed, with a small number captured or surrendered. Equipment losses included ruined coastal installations, destroyed artillery, and damaged fortifications; dozens of naval vessels and landing craft sustained battle damage throughout the operation.
The capture of Iwo Jima provided United States Army Air Forces with forward airfields for fighter escort, emergency landings for damaged B-29 Superfortress bombers, and forward airbases that influenced late-war strategic bombing operations against the Japanese Home Islands. The costly victory informed United States planning for subsequent invasions and the projected assault on Kyushu and the Home Islands, influencing debates at the Pacific War councils and within the Joint Chiefs of Staff about casualty expectations and alternatives to invasion such as the Atomic bombings of Hiroshima and Nagasaki and Operation Downfall planning. The battle also left a lasting cultural and historical legacy through photographic, literary, and memorial representations involving figures such as Joe Rosenthal and monuments like the Marine Corps War Memorial, shaping postwar commemoration and historiography of the Pacific Theater.