 He assumed command of the troop transport on May 17, 1919; the ship ferried troops home from France before being decommissioned in October of that year, whereupon Horne transferred to the destroyer tender , operating with the Pacific Fleet.He remained with "Buffalo" until June 1920, except for a month commanding the cruiser —flagship of Destroyer Squadrons, Pacific Fleet—then commanded the fleet repair ship for a year.Returning ashore in June 1921, he reported as aide to the commandant of the Portsmouth Navy Yard in New Hampshire, then attended the Naval War College in Newport, Rhode Island, and the Army War College in Washington, D.C.