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.
Thomas Custer towards his brother Armstrong's personal battle flag and handed the captured flag to one of Armstrong's aides while declaring, "Armstrong, the damned rebels shot me, but I've got my flag." Custer turned his horse to rejoin the battle, but Armstrong (who had only seconds before seen another of his aides be shot in the face and fall from his horse dead) ordered Custer to report to the surgeon. Tom ignored the order and his brother placed him under arrest, ordering him to the rear under guard. Until 1948, official references for the date of actions for which Thomas Custer was