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.
2nd Cavalry Regiment (United States) after an hour of fighting, the troopers left, took a settler family under their charge and returned safely. All 5 men were awarded the Medal of Honor (SGT Patrick J. Leonard, and PVTs Heth Canfield, Michael Himmelsback, Thomas Hubbard, and George W. Thompson). Today, junior NCOs in the 2nd Cavalry Regiment compete for the Sergeant Patrick James Leonard award. On 17 March 1876, troopers from Companies E, I, and K (156 men) joined the 3rd Cavalry Regiment under COL Joseph J. Reynolds to combat the Cheyenne and Lakota in the ill-fated Big Horn Expedition. During the Battle of Powder River,