He was 43 years old when he was enrolled (4).
He was living in Philadelphia, Pennsylvania, when he was enrolled (4).
He was enrolled and mustered into service as a private on 16 November 1861, at Philadelphia, Pennsylvania (1, 3 [3 Dec 61]). He served as a private in company B (1).
He was discharged on surgeon's certificate of disability, in September 1862 (1, 3).
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) (William Smith)
2 company B, [first] descriptive roll, entry 37 (William Smith) (no information)
3 Civil War Veterans' Card File, available at the Pennsylvania State Archives, searched 31 May 2004 (William Smith)