He was 42 years old when he was enlisted (3, 5 [57 in ?1874]). He was born in Antrim County, Ireland (3, 5).
He was a laborer when he was enlisted (3).
He was 6 feet 0 inches tall, and had a dark complexion, blue eyes, and chestnut hair (3).
He was enlisted and mustered into service on 23 September 1861 (1) or 24 October 1861 (3). He was enlisted for three years, at Philadelphia, Pennsylvania, by Lieutenant Gregory (3). He served as a private in company G (1).
He was discharged on 31 July 1862 on surgeon's certificate of disability at the regimental hospital in Alexandria, Virginia (1, 2, 3). He had served for nine months (5).
On 5 November 1874, he was admitted to the National Soldiers Home (5) He had varicose veins, but was not receiving a pension (5).
He died on 18 June 1879, in the Eastern Branch of the National Soldiers Home, in Togus, Maine (4, 5). He was buried in Togus National Cemetery, in Kennebec County, Maine (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) (William Sproul)
2 company G, register of men discharged, #11 (William Sproul)
3 company G, descriptive roll, #71 (William Sproul)
4 Cemetery records online (searched 20 September 2005) (William Sprowl)
5 Annual report of the Board of Managers of the National Soldiers Home, 30 December 1882 [for the fiscal year ending 30 June 1882]. Serial Set volume 2115, session volume 1, 47th Congress, 2nd Session, House Miscellaneous Document 13, page 378 (Wm Sprowl)
[I did not find an entry for him in the index on <www.ancestry.com> to the pension index by name (searched April 2007)]