Operation Galvanic

Operation Galvanic. It was the United States Pacific War amphibious assault on the Gilbert Islands in November 1943. The operation aimed to seize the strategic Tarawa and Makin atolls, establishing forward airfields for the Central Pacific campaign. The intense fighting, particularly at Tarawa, resulted in heavy casualties but provided critical lessons for future Allied operations across the Pacific Ocean.

Background and planning

Following victories at Midway and Guadalcanal, the United States Navy under Admiral Chester W. Nimitz sought to initiate the Central Pacific campaign against the Empire of Japan. The Gilbert Islands, held by Japan since 1941, were targeted to neutralize Japanese garrisons and secure airfields within range of the Marshall Islands. Planning under V Amphibious Corps commander Holland Smith involved the 2nd Marine Division and the U.S. Army's 27th Infantry Division, with naval support commanded by Vice Admiral Raymond A. Spruance and Rear Admiral Richmond K. Turner. The operation was seen as a necessary first step toward the Mariana Islands and eventually the Japanese home islands.

Opposing forces

The American assault force was a massive joint Marine and Army formation. The 2nd Marine Division, veterans of Guadalcanal, was assigned to capture Tarawa, while the 27th Infantry Division targeted Makin. Naval support came from Task Force 50, including fast carriers like USS ''Enterprise'' and new ''Essex''-class carriers, under the overall command of Admiral Raymond A. Spruance. Japanese defenses were commanded by Rear Admiral Keiji Shibazaki on Tarawa and Captain Kōsō Abe at Makin, consisting of the elite Imperial Japanese Navy Special Naval Landing Forces and Imperial Japanese Army units. The garrison on Betio island was heavily fortified with coastal artillery, pillboxes, and an intricate system of bunkers.

The Battle of Tarawa

The assault on Tarawa, focused on the tiny island of Betio, began on 20 November 1943 with a naval bombardment from battleships including USS ''Maryland''. Critical miscalculations regarding tide levels left LCVPs and amtracs stranded on the exposed coral reef, forcing Marines to wade hundreds of yards under devastating machine gun fire. Despite fierce resistance from Rear Admiral Keiji Shibazaki's forces, elements of the 2nd Marine Division like the 2nd Marine Regiment secured a tenuous foothold. After 76 hours of brutal close quarters combat, the island was declared secure on 23 November, but at a tremendous cost, with the Marines suffering nearly 1,000 killed and 2,000 wounded.

The Battle of Makin

Concurrently, the U.S. Army's 27th Infantry Division landed on Makin atoll on 20 November 1943, meeting initially light resistance from the smaller garrison under Captain Kōsō Abe. However, the operation became protracted due to cautious tactics, drawing criticism from Marine commanders like Holland Smith. The capture of Makin was completed by 23 November, but the strategic victory was marred by the loss of the escort carrier USS ''Liscome Bay'', torpedoed by the Japanese submarine I-175 with heavy loss of life.

Aftermath and significance

The high casualties of Operation Galvanic, especially at Tarawa, shocked the American public and military command. However, the operation provided invaluable lessons in amphibious warfare, leading to improved naval gunfire support, better tide and hydrographic intelligence, increased use of amtracs, and revised pre-assault bombardment tactics. These hard-learned doctrines were directly applied to subsequent successes in the Marshall Islands campaign, including the Battle of Kwajalein and Battle of Eniwetok. The capture of the Gilbert Islands provided vital forward airbases for USAAF B-24 Liberator bombers, extending Allied reach into the Central Pacific and setting the stage for the eventual assault on the Mariana Islands. Category:Pacific War Category:1943 in the United States Category:Amphibious operations of World War II