IV Corps (United States)

IV Corps
Shoulder sleeve insignia
Active	1918–19 1939–45 1958–68
Country	United States
Branch	United States Army
Size	Corps
Engagements	World War I Battle of Saint-Mihiel Battle of Lorraine World War II Gothic Line Spring 1945 offensive in Italy
Commanders
Notable commanders	Alexander Patch Willis D. Crittenberger

World War I

World War II

IV Corps was a corps-sized formation of the United States Army that saw service in both World War I and World War II.

The corps was first organized on 20 June 1918, during World War I as part of the American Expeditionary Forces serving on the Western Front, as Headquarters IV Army Corps. It participated in the offensives of St. Mihiel and Lorraine, being demobilized in Weimar Republic, 11 May 1919.

Formerly reactivated without interruptions since October 1939, during World War II, the IV Corps was reconstituted on June 27, 1944, replacing the VI Corps in the U.S. Fifth Army's order of battle in the Italian campaign, after Allied forces liberated the Italian capital of Rome in the summer of 1944 when VI Corps was withdrawn to take part in Operation Dragoon, the Allied invasion of southern France. Initially the corps had two divisions--the U.S. 1st and South African 6th Armoured Divisions--but was reinforced with the U.S. 92nd Infantry Division from August, the 1st Brazilian Infantry Division from September, and the U.S. 10th Mountain Division in February 1945, as well as the U.S. 85th Infantry Division in April.