He was 22 years old when he was enlisted (2).
He was enlisted and mustered into service on 24 June 1862 (1, 2). He was enlisted at Washington, DC (2). He was mustered in as a private, at Washington, DC (2). He served in company E (1). However, the company E descriptive roll seems not to include him.
He was not on the muster-out roll (1, 2).
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) (Thomas Allison)
2 Civil War Veterans' Card File, available at the Pennsylvania State Archives, searched 18 August 2004 (Thomas Allison)
[I did not find an entry for him in the index on <www.ancestry.com> to the pension index by name (searched October 2006)]
[I did not find an entry for him in the index on <www.ancestry.com> to the 1890 veterans' census (searched October 2006)]