Fort Custer (Montana) Fort Custer (Montana) Fort Custer was established during the Indian wars in the Department of Dakota by the U.S. Army to subjugate the Sioux, Cheyenne and Crow Indians near present-day Hardin, Montana. The post was named for General George Armstrong Custer who died at the Battle of the Little Big Horn. In April and May, 1877, three companies (C, F and G) were moved from Cheyenne Agency, and three companies ( A, B and H) from Fort Yates in the Standing Rock Agency to the Little Big Horn, Montana, under the command of Lieut.-Colonel G. P. Buell, 11th Infantry, where
Thomas Custer in the Yellowstone Expedition of 1873, where he fought in the Battle of Honsinger Bluff, and the Black Hills Expedition of 1874. Custer was appointed captain in 1875 and given command of Company C of the 7th Cavalry. In 1874, at the trading post at Standing Rock Agency, Custer participated in the arrest of chief Rain-in-the-Face (Lakota), suspected in the 1873 murder of Dr. John Honsinger. During the 1876 Little Bighorn campaign of the Black Hills War, he served as aide-de-camp to his older brother Lt. Col. George A. Custer and died with his brother on June 25, 1876. Lt.