Bates (1) has Charles O; the company E death list (2) and descriptive roll (3) have Charles A.
He was 19 years old when he enlisted in 1864, and was born in Philadelphia Pennsylvania (3). He was a machinist (3).
He was 5 feet 5-1/2 inches tall, had a dark complexion, dark eyes, and dark hair (3).
He enlisted, as a recruit, and was mustered into service for three years, on 9 February 1864, in Philadelphia Pennsylvania (1, 3). He was enlisted by Lieutenant Shipley, and mustered into service by Lieutenant Burke (3). He served as a private in company E (1, 3).
He was wounded on 18 June 1864 (4). He died on 19 June 1864 of wounds received at Petersburg, Virginia (1), having been shot in the breast while charging the enemy's works (2, 3).
On 26 January 1865, company E published resolutions mourning his death (and fifteen others), and sympathizing with their families (5).
On 19 September 1884 [?], his mother, Julia Mellor, applied successfully for a pension (6).
Nancee McClay is researching Mellor; contact her at VETTE4NANCEE02@aol.com.
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 list of deaths, company E
3 descriptive roll, company E, entry 137
4 e-mail, Nancee McClay (May 2004)
5 'Headquarters company E', Philadelphia Inquirer 26 January 1865 page 5 (Charles Mellor)
6 pension index, by name (Charles A Mellor)
[I did not find an entry for him in the index on <www.ancestry.com> to the 1890 veteran's census (searched May 2007)]