U.S. Marines Land on Iwo Jima

Context

By early 1945, U.S. forces had secured the Mariana Islands, placing B-29 Superfortress bombers within range of the Japanese home islands for the first time. The long-distance raids, however, exposed the heavy bombers to fighter interception and left damaged aircraft with few options for emergency landings or fighter escort.

Iwo Jima, a small volcanic island in the Volcano chain roughly 660 miles from Tokyo, held two airfields that could address these gaps by hosting P-51 Mustang escort fighters and providing forward bases. Japanese planners recognized the island's value as an early-warning outpost and had reinforced it accordingly.

Lieutenant General Tadamichi Kuribayashi took command of the garrison in mid-1944 and directed the construction of an extensive network of tunnels, bunkers, and concealed artillery positions designed to maximize defensive staying power rather than rely on open-field counterattacks.

What Happened

Operation Detachment opened on February 19, 1945, when the first waves of Marines from the 4th and 5th Divisions waded ashore on the southeastern beaches under cover of naval gunfire and carrier air strikes commanded by Admiral Raymond A. Spruance and Vice Admiral Marc Mitscher. The initial landings encountered surprisingly light resistance as Japanese troops remained in their underground positions.

Once thousands of Marines, vehicles, and supplies had accumulated on the black-sand shoreline, Japanese artillery and mortar fire erupted from hidden emplacements, striking the crowded beachhead and the volcanic slopes beyond. Elements of the V Amphibious Corps, led by Major General Harry Schmidt, pressed inland despite mounting losses and difficult terrain.

By nightfall the assault forces had carved out a precarious foothold, though progress toward the airfields and Mount Suribachi remained limited by interlocking fields of fire and the defenders' tunnel system.

Aftermath

Fighting continued for more than five weeks as Marines captured Mount Suribachi on February 23 and gradually secured the two airfields amid close-quarters combat. The island was declared secure on March 26, 1945, though isolated Japanese resistance persisted in caves for weeks afterward.

The captured airfields immediately began receiving damaged B-29s and, later, P-51 escort squadrons, while the broader campaign demonstrated both the effectiveness of prepared island defenses and the high cost of overcoming them.

Legacy

The battle underscored the strategic necessity of intermediate bases for sustained strategic bombing and shaped Marine Corps thinking on amphibious operations for decades. Its most visible symbol, Joe Rosenthal's photograph of the second flag-raising on Mount Suribachi, became an enduring emblem of American resolve in the Pacific War.

Historians continue to cite the engagement as a benchmark for the challenges of assaulting heavily fortified positions and as a precursor to the even larger operation planned for Okinawa two months later.