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.
1st West Virginia Volunteer Cavalry Regiment General Elon J. Farnsworth was assigned command of the 1st Brigade. Brigadier General George Armstrong Custer was assigned command of the 2nd brigade. As the troops moved from Frederick toward Gettysburg, Pennsylvania, the regiment in the rear was attacked by cavalry under the command of General James Ewell Brown "Jeb" Stuart. Farnsworth's 1st Brigade counter-attacked, and with the help of Custer's 2nd Brigade drove off the Confederate cavalry. The 1st West Virginia had 2 killed, 5 wounded, and 18 men taken prisoner. This June 30 battle became known as the Battle of Hanover. The Battle of Gettysburg began on the