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| U.S. Fifth Army (World War II) | |
|---|---|
| Unit name | Fifth Army |
| Dates | 1943–1945 |
| Country | United States |
| Type | Field army |
| Battles | Italian Campaign, Salerno, Anzio, Monte Cassino, Gothic Line, Spring 1945 offensive |
| Notable commanders | Mark W. Clark, Lucian K. Truscott Jr., Olinto M. Barsanti |
U.S. Fifth Army (World War II) The Fifth Army was a principal American field army of the United States Army that conducted operations during the Italian Campaign (World War II), landing in Salerno and fighting through Naples to the Po River and Trieste. It coordinated with Allied formations such as the British Eighth Army, Canadian I Canadian Corps, French Expeditionary Corps, and the Polish II Corps under the overall direction of Allied forces leadership including Dwight D. Eisenhower, Henry Maitland Wilson, and Harold Alexander. The army's campaigns involved engagements at Salerno landings, the Battle of Anzio, and the assaults on the Winter Line and Gothic Line.
The Fifth Army was activated in 1943 from elements of Fifth United States Army Group staff and planned under direction from United States Army Ground Forces, War Department planners, and theater command in Mediterranean Theater of Operations. Its organization followed doctrine influenced by George C. Marshall staff studies, integrating corps such as II Corps (United States), VI Corps (United States), and later XVI Corps (United States) with attached multinational corps including British X Corps, French Corps, and Canadian I Corps. The formation incorporated United States Army Air Forces air support coordination with units like Twelfth Air Force and liaison with Royal Air Force commands based in North Africa and Sicily. Command and staff posts used principles from Combined Chiefs of Staff, with coordination through Allied Force Headquarters and links to United States Fifth Army (World War II) logistic echelons, supply depots at Naples and ports at Salerno.
Initial command was assumed by Mark W. Clark, a senior officer with prior association to North African Campaign (World War II) commanders; Clark led the army through Salerno and much of the Italian drive. Subordinate corps commanders included Lucian K. Truscott Jr., John P. Lucas, and Alphonse G. McAuliffe among others who directed operations at Anzio and on the Liri Valley. Theater and army command interacted with figures such as Bernard Montgomery, Omar Bradley, and Alexander Patch for coordination with Allied 15th Army Group and Southwest Pacific Area planners. Political liaison involved representatives from United States Department of State and British War Cabinet, while liaison officers communicated with Italian Co-belligerent Army and Monarchy of Italy authorities during liberation phases.
Fifth Army operations began with Operation Avalanche at Salerno and progressed through the Volturno Line and the Winter Line, including assaults near Monte Cassino that involved the Polish II Corps, New Zealand Corps elements, and Indian Army units operating under British Eighth Army but in synchronized campaigns. The army conducted amphibious operations at Anzio (Operation Shingle) and subsequent breakout operations from Anzio beachhead toward Rome and Liri Valley. Later operations pressed the Gothic Line defense and supported the Spring 1945 offensive in Italy which saw cooperation with French Expeditionary Corps mountain troops and armored elements from British V Corps and 78th Division (United Kingdom). Coordination with Royal Navy and United States Navy naval gunfire supported coastal operations at Salerno and Anzio landings.
The army's prominent battles included the Landings at Salerno, the protracted Battle of Anzio, the gruelling Battles for Monte Cassino, the crossings of the Garigliano River and Rapido River, the assault on the Gothic Line, and the final advances in the Po Valley culminating in operations around Trieste and Padua. Engagements involved opposing formations such as elements of the German Wehrmacht, Luftwaffe interdiction, and Italian Social Republic forces where present. The Fifth Army fought alongside Allied multinational corps including the Brazilian Expeditionary Force in Italy, and coordinated offensives with British Eighth Army and U.S. II Corps actions to encircle and defeat German forces withdrawing through Northern Italy.
Major subordinate units included II Corps (United States), VI Corps (United States), and XVI Corps (United States) at various times, with divisions such as the 36th Infantry Division (United States), 45th Infantry Division (United States), 34th Infantry Division (United States), 1st Armored Division (United States), 3rd Infantry Division (United States), and multinational divisions like the 1st Canadian Infantry Division, 4th Indian Division, and Polish II Corps divisions. Auxiliary and support formations included 7th Army Air Force liaison elements, Army Service Forces supply units, Corps of Engineers engineer battalions, Chemical Corps detachments, and medical units from the United States Army Medical Department. Artillery was provided by corps and divisional field artillery groups, with armor support from units including the CCL Tank Battalion and attached British Churchill tanks in cooperative operations.
Logistics relied on ports at Salerno, Naples, and later Livorno and railheads secured through coordination with Allied Military Government for Occupied Territories and the Army Service Forces. Supply chains faced interdiction by Luftwaffe attacks and exigencies from rugged terrain such as the Apennine Mountains, requiring reliance on Red Ball Express-style truck convoys and engineer-built bridges. Medical evacuation used field hospitals and evacuation flights to Caserta and Gibraltar staging, while prisoners and displaced civilians were handled by military police and International Red Cross representatives. Casualties mounted in major engagements like Monte Cassino and Anzio with thousands killed, wounded, and missing, and prisoners taken from Wehrmacht units during the 1945 offensive.
After the German Instrument of Surrender in Italy and the end of hostilities in Europe, Fifth Army units participated in occupation tasks, repatriation and demobilization under directives from United States European Theater of Operations and were gradually disbanded or reconstituted into peacetime formations per National Security Act of 1947 reorganizations. The army's legacy influenced postwar doctrine in United States Army armored and infantry combined-arms tactics, commemorated in memorials in Anzio War Cemetery, Cassino War Cemetery, and museums such as the National World War II Museum and regional Italian memorials. Veterans' associations, regimental histories, and official after-action reports preserved lessons for later formations in Korean War and Cold War planning.
Category:United States Army Field Armies Category:Military units and formations of the United States in World War II