Okinawa (battle)
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| Conflict | Battle of Okinawa |
| Partof | Pacific War (World War II) |
| Date | 1 April – 22 June 1945 |
| Place | Okinawa Island, Ryukyu Islands, Japan |
| Result | Allied victory; United States of America occupation of Okinawa |
| Combatant1 | United States; United Kingdom (naval and air units); Commonwealth of Nations naval forces |
| Combatant2 | Empire of Japan |
| Commander1 | Chester W. Nimitz; Douglas MacArthur; Simon Bolivar Buckner Jr.; Joseph Stilwell; Richmond K. Turner |
| Commander2 | Hisaichi Terauchi; Kikuma Shimoda; Isamu Cho; Yoshitsugu Saito |
| Strength1 | ~182,000 United States Army and United States Marine Corps troops; supporting United States Navy and United States Army Air Forces |
| Strength2 | ~77,000 Imperial Japanese Army and Navy personnel; Okinawan conscripts |
| Casualties1 | ~12,520 killed; ~36,500 wounded; naval losses from kamikaze attacks |
| Casualties2 | ~77,000–110,000 dead (including civilians); large numbers captured and missing |
Okinawa (battle) was a major Pacific War engagement fought on Okinawa Island in the Ryukyu Islands from 1 April to 22 June 1945. The operation, code-named Operation Iceberg, involved massive United States amphibious landings, extended joint United States Army and United States Marine Corps operations, overwhelming Imperial Japanese Army and Imperial Japanese Navy defenses, and intensive naval and air campaigns including widespread kamikaze attacks. The battle became the largest amphibious assault in the Pacific Theater and played a decisive role in shaping Allied plans for a possible invasion of the Japanese home islands, influencing the use of atomic bomb diplomacy and postwar occupation arrangements.
Background
In late 1944 and early 1945, strategic planning by Admiral Chester W. Nimitz and theatre commanders emphasized seizure of forward bases to support United States Army Air Forces strategic bombing of Japan and logistical staging for a potential invasion of the home islands. The capture of the Marianas Islands, Philippines, and Iwo Jima had set the stage for Operation Iceberg. Political leaders such as Franklin D. Roosevelt and military planners including Douglas MacArthur debated priorities. Okinawa's proximity to the Kanto Plain and Tokyo made the island strategically valuable for B-29 Superfortress operations, carrier strikes from United States Navy task forces, and as a staging area for Operation Downfall. Japanese strategic doctrine under General Hisaichi Terauchi and the Imperial General Headquarters emphasized attritional defense, reinforced by orders from Hideki Tojo-era leadership and later wartime leadership in Tokyo.
Opposing forces
Allied forces were led by Admiral Chester W. Nimitz and Admiral Richmond K. Turner at sea, with Lieutenant General Simon Bolivar Buckner Jr. commanding the ground forces initially for the United States Tenth Army, which incorporated units from the United States Army and United States Marine Corps as well as artillery, armor, and engineering elements. Naval aviation support came from United States Navy carrier groups and Royal Navy and Royal Australian Navy escorts. Air support included the United States Army Air Forces and carrier-based United States Naval Aviation.
Japanese defenders were commanded in Okinawa by Lieutenant General Mitsuru Ushijima for ground forces and coordinated with elements of the Imperial Japanese Navy under officers such as Admiral Seiichi Ito and staff of the Southern Expeditionary Army Group. Forces included remnants from the 14th Area Army, local Okinawan conscripts, naval infantry detachments, and fortified garrison units employing extensive tunnel networks and prepared positions.
Battle timeline
The operation began on 1 April 1945 with amphibious landings on the western coast of Okinawa by the United States Tenth Army, supported by heavy naval bombardment from United States Navy battleships and cruisers. Initial objectives included securing airfields such as Yontan Airfield and Hedo Misaki approach zones to deny Japanese air operations. Between April and May fierce fighting centered on the Shuri Line, a series of defensive positions around Shuri Castle and southern ridgelines. In May, the kamikaze campaign intensified against Allied naval forces during operations near Kerama Islands and Miyakojima. By June the southern pocket was reduced, and organized Japanese resistance collapsed; Okinawa was declared secured on 22 June 1945.
Combat operations and tactics
Allied tactics combined large-scale amphibious assault doctrine refined since Guadalcanal campaign and the Marshall Islands campaign with combined arms integration of infantry, armor, artillery, close air support from United States Army Air Forces, and naval gunfire support from United States Navy battleships such as USS Missouri (BB-63) and cruisers. Japanese defensive tactics relied on depth, concealment, and strongpoints within cave and tunnel complexes modeled after earlier Saipan and Iwo Jima defenses, and included massed counterattacks, counter-battery fire, and extensive use of kamikaze aircraft launched against carrier groups and transports. Urban and cave fighting around Shuri and coastal plains produced heavy casualties and required ordnance such as flamethrowers, demolition charges, and close infantry assaults.
Naval operations featured carrier strikes by Task Force 58 air groups, escort carrier anti-submarine warfare, and an intense campaign by Imperial Japanese Navy special attack units culminating in the Battle of Okinawa (naval phases) with major losses to fleet escorts and destroyers. Logistical operations for the United States Tenth Army involved unprecedented sustainment through captured airfields and amphibious resupply.
Casualties and losses
Casualty estimates vary widely. Allied losses included approximately 12,520 killed and some 36,500 wounded among United States ground forces, with additional naval casualties from kamikaze strikes, damaged or sunk destroyer and LST vessels, and losses among United Kingdom and Commonwealth sailors. Japanese military fatalities numbered tens of thousands, with many sources citing 77,000–110,000 dead among combatants and support personnel. Civilian deaths on Okinawa were catastrophic, with estimates of 40,000–150,000 Okinawan civilians killed or missing due to combat, forced mass suicides influenced by propaganda from Imperial Japanese authorities, and collateral effects of bombardment. Material losses included the destruction of most Okinawan infrastructure, loss of airfields, and heavy naval tonnage damaged.
Aftermath and occupation
Following surrender of remaining Japanese forces, Okinawa became a major United States military occupation and strategic base. The island served as a staging area for B-29 operations, as a forward logistics hub, and later as a centerpiece of United States–Japan Security Alliance arrangements. The destruction of Okinawan society and the death toll influenced postwar political debates in Japan and internationally over the use of air power, civilian protection, and the legitimacy of invasion plans for the Home Islands. War crime investigations and inquiries examined events tied to civilian treatment and command decisions by Imperial Japanese officers. Okinawa remained under United States Military Government of the Ryukyu Islands administration until its reversion to Japan in 1972, shaping contemporary Okinawa Prefecture relations with United States forces and the geopolitics of the Cold War in East Asia.