He was born in Cardiff, Wales (4). He was 22 years old when he was enlisted (4).
He was a tailor when he was enlisted (4). He was living in Bucks County, Pennsylvania (4).
He was 5 feet 4-7/8 inches tall, and had a light complexion, grey eyes, and brown hair (4).
He was enlisted and mustered into service on 1 March 1865 (1, 4) or (I suspect) 1 March 1864. He was enlisted at Philadelphia, Pennsylvania (4). He was mustered in, at Philadelphia, Pennsylvania, as a private in company I (1, 4).
He deserted on 9 March 1864 or 1865, from Philadelphia, Pennsylvania (1 [1865], 3 [1864], 4 [1865]).
He may be the Dempsey whom Sinex asked on 27 April 1864 be sent to the regiment (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)
2 letter, Sinex to Marvin, 27 April 1864
3 company I, register of deserters (Edward Dempsey)
4 Civil War Veterans' Card File, available at the Pennsylvania State Archives, searched 28 March 2005 (Edward Dempsey)
[I did not find an entry for him in the index on <www.ancestry.com> to the pension index by name (searched December 2006)