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.
Henry Armstrong Reed Custer. Heavily influenced by his military uncles, he followed in their footsteps and left Monroe in May 1876, with his sister Emma, for Fort Abraham Lincoln in the Dakota Territory. There, he was hired on May 10 to serve as a beef herder for the 7th Cavalry Regiment, which was under the command of George Armstrong Custer. Reed joined the 7th Cavalry Regiment shortly after the start of the Great Sioux War of 1876–77 in the Montana Territory, part of the larger American Indian Wars. While Reed was never officially enlisted as a soldier, he volunteered his services as such