Thomas Mower McDougall subsequently he was appointed Captain, 15 Dec 1875. In 1876 Captain McDougall commanded Company B and accompanied the 7th Cavalry Regiment, under command of Lt. Col. George A. Custer in its fateful departure from Fort Abraham Lincoln to participate in what became known as the Great Sioux War of 1876, which culminated in the Battle of the Little Bighorn, also known as Custer's Last Stand which occurred on June 25–26, 1876. On May 17, 1876, the 7th Cavalry left their base at Fort Abraham Lincoln near present day Mandan, North Dakota to join in a campaign against the Sioux Indians.
Presidency of Ulysses S. Grant the committee's demands and signed the agreement. During the Great Sioux War, Grant came into conflict with Col. George Armstrong Custer after he testified in 1876 about corruption in the War Department under Secretary William W. Belknap (see below). Grant had Custer arrested for breach of military protocol in Chicago and barred him from leading an upcoming campaign against the Sioux. Grant finally relented and let Custer fight under Brig. Gen. Alfred Terry. Two months after Custer's death Grant castigated him in the press, saying "I regard Custer's massacre as a sacrifice of troops, brought on by Custer himself, that