He was 22 years old when he enlisted in 1861 (4). He was born in Philadelphia, Pennsylvania (4).
He was a glass blower (4).
He was 5 feet 8-1/2 inches tall, and had a dark complexion, blue eyes, and dark hair (4).
He enlisted and was mustered into service on 16 November 1861 (1, 4, 5). He was enlisted for three years, at Philadelphia, Pennsylvania, by Captain Gilbert (4). He served as a private, initially in company G (1).
He was transferred on 4 December 1861 to company A (1, 6).
He was discharged at Philadelphia, Pennsylvania, on 23 June 1862 on surgeon's certificate of disability, by order of Brigadier General Montgomery [?] (1, 3, 4, 5). He was then a private (1, 3).
On 11 March 1880, he applied unsuccessfully for a pension (2, 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)
2 pension index, by name (William Weaver)
3 register of men discharged, co.A (William Weaver)
4 company A descriptive roll, entry 71 (William M Weaver)
5 pension index, by regiment (William M Weaver)
6 company G, register of men transferred (William Weaver)
[I did not find him in the <www.ancestry.com> index to the 1890 veterans' census (searched October 2005)