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
George Armstrong Custer Hills region from the Sioux. When the Sioux refused to sell, they were ordered to report to reservations by the end of January, 1876. Mid-winter conditions made it impossible for them to comply. The administration labeled them "hostiles" and tasked the Army with bringing them in. Custer was to command an expedition planned for the spring, part of a three-pronged campaign. While Custer's expedition marched west from Fort Abraham Lincoln, near present-day Mandan, North Dakota, troops under Colonel John Gibbon were to march east from Fort Ellis, near present-day Bozeman, Montana while a force under General George Crook was to