He was 23 years old when he enlisted in 1861 (4). He was born in County Tyrone, Ireland (4).
He was a farmer (4).
He was 5 feet 4 inches tall, and had a dark complexion, blue eyes, and dark hair (4).
He enlisted and was mustered into service on 28 October 1861 (1, 3). He was enlisted for three years, at Philadelphia, Pennsylvania, by Lieutenant Hamberg (3). He served as a private, initially in company G (1).
He was transferred in December 1861 to company A (1, 4).
He was discharged at Alexandria, Virginia, on 15 July 1862 on surgeon's certificate of disability (1, 2, 3). He was then a private (1, 2).
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) (John Cook)
2 Register of men discharged, co.A (John Cook)
3 company A descriptive roll, entry 82 (John Cook)
4 company G, register of men transferred (John Cook)
[I did not find an entry for him in the index on <www.ancestry.com> to the 1890 veterans' census]