4th Cavalry Regiment (United States) companies of the 4th Cavalry to Fort Clark. This time Mackenzie led a larger and more extensive expedition into Mexico, restored a system of patrols, and reestablished peace in the devastated region of South Texas. Outside Texas, Mackenzie and the 4th Cavalry administered and controlled the Kiowa-Comanche and the Cheyenne-Arapaho reservations for several years, and, after the defeat of George Armstrong Custer's command at the Battle of Little Bighorn in June 1876, forced Crazy Horse and his band of Sioux and the Northern Cheyennes to surrender. In the autumn of 1879, Mackenzie with six companies of the 4th Cavalry subdued
George Armstrong Custer had written to Johnson some weeks before seeking such a commission. Custer and his wife stayed with the president during most of the trip. At one point Custer confronted a small group of Ohio men who repeatedly jeered Johnson, saying to them: "I was born two miles and a half from here, but I am ashamed of you." On July 28, 1866, Custer was appointed lieutenant colonel of the newly created 7th Cavalry Regiment, which was headquartered at Fort Riley, Kansas. He served on frontier duty at Fort Riley from October 18 to March 26, and scouted in Kansas and