The Fourth Corps was a military unit in the United States Army, primarily active during the American Civil War. It was established in 1862 and played a significant role in various battles, including the Battle of Gettysburg and the Siege of Petersburg. The corps was known for its organization and effectiveness in combat. The Fourth Corps was part of the Army of the Cumberland and was composed of several divisions. It was commanded by notable leaders such as Major General Gordon Granger and Major General John M. Palmer. The corps contributed to key military strategies and operations throughout the war, helping to shape the outcome of the conflict.