Elizabeth Bacon Custer led the Seventh Cavalry in pursuit of Sitting Bull, Crazy Horse and the Sioux and Northern Cheyenne who refused to be confined to the reservation system. After her husband's column was wiped out at the Battle of the Little Big Horn in June 1876, many in the press, Army, and government criticized Custer for blundering into a massacre. President Ulysses S. Grant publicly blamed Custer for the disaster. Fearing that her husband was to be made a scapegoat by history, Libbie launched a one-woman campaign to rehabilitate her husband's image. Her assistance to the author of the first Custer biography,
5th Cavalry Regiment Henry Thomas. The regiment was rebuilt with new officers and recruits loyal to the Union and was assigned to the Army of the Potomac under the command of General George McClellan. On 21 July 1861, the regiment participated in its first battle of the American Civil War, the First Battle of Bull Run; it was the last action in which they would be called the "2nd Cavalry." In the summer of 1861, all regular mounted regiments were re-designated as "cavalry", and being last in seniority among the existing regiments, the regiment was re-designated as the 5th United States Cavalry. During