Overview
The Battle of Okinawa, fought from 1 April to 22 June 1945, was the final major campaign of the Pacific War and the largest amphibious assault mounted by U.S. forces in the theatre. The island’s strategic value lay in its proximity to Japan—roughly 340 miles from Kyushu—making it a critical staging area for the planned invasion of the Japanese home islands. American forces, primarily the U.S. Tenth Army under General Simon Bolivar Buckner Jr., faced entrenched Japanese defenders commanded by General Mitsuru Ushijima, who adopted a defence‑in‑depth strategy rather than attempting to repel the initial landings.
The early phases saw limited resistance on the beaches, but once U.S. troops advanced inland they encountered a network of fortified ridges, caves, and bunkers forming the Shuri defensive line. Fighting became attritional, characterised by close‑quarters assaults, flamethrowers, demolition charges, and persistent artillery duels. The Japanese employed extensive kamikaze operations against the U.S. fleet offshore, inflicting significant losses, including the sinking of the battleship USS Arizona’s sister ship USS Pennsylvania and severe damage to numerous destroyers and support vessels.
Private John L. Drugan and his dog Pal on Okinawa, May 1945. Pal saved a platoon of Marines from an ambush by alerting his handler of a hidden Japanese machine gun nest. Okinawa, May 1945.
Civilian suffering was extensive. Okinawan non‑combatants were caught between advancing American forces and Japanese directives that discouraged surrender. Many civilians were displaced, forced into caves, or killed during bombardments. The battle resulted in more than 100,000 civilian deaths, alongside approximately 12,500 American combat fatalities and over 90,000 Japanese military dead.
By late June, organised Japanese resistance collapsed with the fall of the Shuri line and the deaths of Ushijima and his chief of staff, General Isamu Cho. Okinawa’s capture provided the United States with airfields and logistical bases for intensified bombing of Japan. The scale of casualties and ferocity of the fighting influenced American strategic thinking, contributing to the decision to employ atomic weapons rather than undertake a direct invasion of the Japanese mainland.