He was 47 years old when he was enrolled (4).
He was enrolled and mustered into service as a private on 17 January 1862, at Philadelphia, Pennsylvania (1, 4). He served as a private in company B (1).
He was discharged in December 1862 on surgeon's certificate of disability (1, 2, 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)
2 consolidated morning report, 13 February 1863
3 company B, descriptive roll, entry 28 (William Hill) (no information)
4 Civil War Veterans' Card File, available at the Pennsylvania State Archives, searched 31 May 2004 (William Hill)