George Armstrong Custer was a United States Army officer and cavalry commander in the American Civil War and the Indian Wars. At the start of the Civil War, Custer was a cadet at the United States Military Academy at West Point, and his class's graduation was accelerated so that they could enter the war. Custer graduated last in his class and served at the First Battle of Bull Run as a staff officer for Major General George B. McClellan in the Army of the Potomac's 1862 Peninsula Campaign. Early in the Gettysburg Campaign, Custer's association with cavalry commander Major General Alfred Pleasonton earned him promotion from First Lieutenant to Brigadier General of United States Volunteers at the age of 23.
At the end of the Civil War, Custer was promoted to Major General of United States Volunteers. In 1866, he was appointed to the Regular U.S. Army rank of Lieutenant Colonel, leading the 7th U.S. Cavalry and served in the Indian Wars. His distinguished war record, which started with riding dispatches for General Scott, has been overshadowed in history by his role and fate in the Indian Wars. Custer was defeated and killed at the Battle of the Little Bighorn in 1876, against a coalition of Native American tribes composed almost exclusively of Sioux, Cheyenne, and Arapaho warriors, and led by the Sioux warrior Crazy Horse and the Sioux leaders Gall and Sitting Bull. This confrontation has come to be popularly known in American history as Custer's Last Stand.