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.
George Armstrong Custer the field, with relative ease. As he approached, they were ordered back into the woods, without slowing down Stuart's column, "advancing as if in review, with sabers drawn and glistening like silver in the bright sunlight..." Stuart's last obstacle was Custer, with four hundred veteran troopers of the First Michigan Cavalry, directly in his path. Outnumbered but undaunted, Custer rode to the head of the regiment, "drew his saber, threw off his hat so they could see his long yellow hair" and shouted... "Come on, you Wolverines!" Custer formed his men in line of battle and charged. "So sudden was