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.
Battle of the Little Bighorn an expedition of this size, and part of the officer shortage was chronic, due to the Army's rigid seniority system: three of the regiment's 12 captains were permanently detached, and two had never served a day with the 7th since their appointment in July 1866. Three second lieutenant vacancies (in E, H, and L Companies) were also unfilled. The Army's coordination and planning began to go awry on June 17, 1876, when Crook's column retreated after the Battle of the Rosebud, just to the southeast of the eventual Little Bighorn battlefield. Surprised and according to some accounts astonished by the