Could he be the Thomas Briggs Knowles, born 19 June 1845, died 10 February 1924 in Doylestown, Bucks County, Pennsylvania, and buried in Doylestown Cemetery, Bucks County, Pennsylvania? (See Find a grave memorial 33449855 (accessed 20 February 2011).)
He was born in 1841/42 (3 (19 in 1861)). He was born in Bucks [County], Pennsylvania (3).
When he enlisted, he was 5 feet 5 inches tall, and had a light complexion, hazel [?] eyes, and light hair (3).
He was mustered into service on 5 November 1861 (1, 3). He was enlisted for three years, at Philadelphia, Pennsylvania, by Captain Casner (3). He was mustered in as a private in company K, by Lieutenant Francis Gregory (1, 3, 4).
He deserted from Philadelphia, Pennsylvania, on 14 January 1862 (1, 2). He was a private, in company K (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) (Thos B Knowles)
2 company K, register of deserters, entry 13 (Thomas B Knowles)
3 company K, descriptive roll (Thomas B Knowles)
4 index to compiled service records of volunteer Union soldiers who served in organizations from the state of Pennsylvania (Thomas B Knowles)