Fort Abraham Lincoln log scouts' quarters. Water was supplied to the fort by being hauled from Missouri River in wagons, while wood was supplied by contract. By 1873, the 7th Cavalry moved into the fort to ensure the expansion of the Northern Pacific Railway. The first post commander of the expanded fort was Lieutenant Colonel George A. Custer, who held the position until his death in 1876. In 1876, the Army departed from here as part of the Great Sioux War of 1876-77, resulting in Custer's defeat at the Battle of the Little Bighorn, where they were to push the non-treaty Indians back
Boston Custer ("Tom"), became military officers in the Union Army during the American Civil War. Boston had been unable to officially join the Army due to poor health. A civilian contractor, Custer served as forage master for his brother George's U.S. 7th Cavalry Regiment in the 1874 Black Hills expedition. He was employed as a guide, forager, packer and scout for the regiment for the 1876 expedition against the Lakota Indians. On June 25, 1876, along with his 18-year-old nephew Henry Armstrong "Autie" Reed, Custer was with the pack train at the rear of Lt. Col. George Custer's troops. Hearing from a