He was 28 years old when he was enlisted (4).
He was enlisted and mustered into service on 30 September 1861 (1, 4). He was enlisted at Philadelphia, Pennsylvania (4). He was mustered in as a private, at Philadelphia, Pennsylvania (4). He served as a private in company D (1).
He may have been declared a deserter on 27 February 1863 (2).
On 3 November 1863, he may have been reported regained from desertion and under arrest (3).
He was not on the muster-out roll (1, 4).
1 Bates, Samuel Penniman. History of Pennsylvania volunteers, 1861-5. Harrisburg: B. Singerly, state printer, 1869-71. 5 volumes. 'Ninety-first regiment', volume 3, pages 186-233. (In the roster) (George Stewart)
2 consolidated morning report, 91st PA, 27 February 1863 (Private Stewart; this could be Robert Stewart)
3 consolidated morning report, 91st PA, 3 November 1863 (Priv Steward; this could be Robert Stewart)
4 Civil War Veterans' Card File, available at the Pennsylvania State Archives, searched 10 August 2004 (George Stewart)