He was 24 years old when he was enlisted (3).
He was enlisted and mustered into service on 3 October 1861 (1, 3 [10 Nov]). He was enlisted at Philadelphia, Pennsylvania (3). He was mustered in as a private, at Philadelphia, Pennsylvania (3). He served as a private in company D (1).
He deserted at Camp Chase, Philadelphia, Pennsylvania, on 26 January 1862 (1, 3) or 8 October 1861 (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) (John Geil)
2 company D, register of deserters (John Geil)
3 Civil War Veterans' Card File, available at the Pennsylvania State Archives, searched 9 August 2004 (John Geil; roll has 'John Giel')
[I did not find an entry for him in the index on <www.ancestry.com> to the pension index by name (searched February 2007)]