In October 1885, while still a member of the U.S. 7th Cavalry Regiment, he reported for duty at St. John's College (now known as Fordham University) in New York, as the school's first Professor of Military Science and Tactics. He trained and outfitted an impressive Corps of Cadets, the predecessor of today's Army ROTC program at Fordham. In December 1890, he left the college and returned to the U.S. 7th Cavalry Regiment on detached service at Fort Leavenworth to appear before a board for promotion to First Lieutenant. He returned to the regiment 4 January 1891, about a week after the Battle of Wounded Knee. Troop K took heavy losses during the battle and Captain Wallace (a survivor of the Little Big Horn) and five troopers were killed and 10 wounded. Squiers took command of Troop K but shortly thereafter he resigned and left the Army early in 1891.