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.
Great Sioux War of 1876 staff and the Dakota Column infantry, reached the area and rescued the US survivors of the Reno-Benteen fight. Gibbon then headed his forces to the east, chasing trails but unable to engage the Sioux and Cheyenne warriors in battle. Reinforced with the Fifth Cavalry, General Crook took to the field. Hooking up briefly with General Terry, he soon moved out on his own but did not find a large village. Running short on supplies, his column turned south and made what became called the Horsemeat March toward mining settlements to find food. On September 9, 1876, an advance company from