He was 44 years old when he enlisted in 1861 (3). He was born in Germantown, [Philadelphia,] Pennsylvania (3).
He was a weaver (3).
He was 5 feet 10 inches tall, and had a light complexion, blue eyes, and light hair (3).
He enlisted and was mustered into service on 23 August 1861 (1, 3, 4). He was enlisted for three years, at Philadelphia, Pennsylvania, by Captain Starr (3). He served as a private in company A (1).
He was discharged at a camp in the field on 22 December 1862 on surgeon's certificate of disability (1, 2, 3, 4). He was then a private (1, 2).
On 2 October 1877, he applied successfully for a pension (4, 5).
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) (Charles Guyer)
2 Register of men discharged, co.A (Charles Guyer [the 'u' is reasonably clear])
3 company A descriptive roll, entry 23 (Charles Gayer [the 'a' is clearly closed])
4 pension index, by regiment (Charles Guyer)
5 pension index, by name (Charles Guyer)
I did not find him in the index on <www.ancestry.com> to the 1890 veterans' census (searched October 2005)