Portrait of Henry E. Thompson, 1862-1865. Grand Rapids. Entered service in company A, Sixth Cavalry, at organization, as Second Lieutenant, July 18, 1862, at Detroit, for 3 years, age 25 ... Brevet Colonel, U.S. Volunteers, March 13, 1865, for gallant and meritorious services during the war. For further description see (Descriptive Roll Sixth Cavalry Volunteers).