American II Corps

II Corps
Shoulder sleeve insignia of the II Corps.
Active	24 February 1918 – 1 February 1919 (U.S. Army) 29 July 1921 – 15 August 1927 (U.S. National Guard) 15 August 1927 (U.S. Army) 1 August 1940 – 10 October 1945 March 1958 – 5 June 1970
Country	United States
Branch	United States Army
Type	Corps
Garrison/HQ	Camp Kilmer, New Jersey (after 1958)
Engagements	World War I World War II
Commanders
Notable commanders	Mark W. Clark Lloyd Fredendall George S. Patton Omar Bradley

The II Corps was a corps-sized formation of the United States Army that was active in both World War I and World War II. It was originally formed and fought on the Western Front during World War I and was also the first American formation of any size to see combat in North Africa or Europe during World War II.

II Corps was organized on 24 February 1918.

It first saw significant action in Europe in August 1918, in the Hundred Days Offensive, as part of the British Third Army. Advances made during a secondary assault by the Australian Corps (Battle of Albert) on 21–23 August, were exploited by the Allies in the Second Battle of the Somme. This pushed the German 2nd Army back along a 50-mile (80 km) front line. British and US units advanced on Arras. On 29 August, Bapaume fell to the New Zealand Division and other elements of the British IV Corps. This allowed the Australian Corps to cross the Somme River on 31 August and break the German lines in the Battle of Mont St. Quentin.

During late September 1918, with two Army National Guard Divisions (27th and 30th, less their artillery) under command, II Corps was attached to the Australian Corps as part of British Fourth Army. The Corps was involved in the Battle of St Quentin Canal, during which it suffered heavy losses.