Thomas Custer in the Yellowstone Expedition of 1873, where he fought in the Battle of Honsinger Bluff, and the Black Hills Expedition of 1874. Custer was appointed captain in 1875 and given command of Company C of the 7th Cavalry. In 1874, at the trading post at Standing Rock Agency, Custer participated in the arrest of chief Rain-in-the-Face (Lakota), suspected in the 1873 murder of Dr. John Honsinger. During the 1876 Little Bighorn campaign of the Black Hills War, he served as aide-de-camp to his older brother Lt. Col. George A. Custer and died with his brother on June 25, 1876. Lt.
George Armstrong Custer Michigan Infantry across the Chickahominy River above New Bridge. The attack was successful, resulting in the capture of 50 Confederate soldiers and the seizing of the first Confederate battle flag of the war. McClellan termed it a "very gallant affair" and congratulated Custer personally. In his role as aide-de-camp to McClellan, Custer began his life-long pursuit of publicity. Custer was promoted to the rank of captain on June 5, 1862. On July 17, he was reverted to the rank of first lieutenant. He participated in the Maryland Campaign in September to October, the Battle of South Mountain on September 14,