He was born in Philadelphia, Pennsylvania (7). He was born in 1840/41 (7 (21 in 1862)).
When he enlisted, he was a stove m[aker?] (7).
When he enlisted, he was 5 feet 8 inches tall, and had a light complexion, hazel eyes, and brown hair (7).
He also served in the Navy (9).
He enlisted and was mustered into service on 9 August 1862 (1, 7). He was enlisted for three years, at Philadelphia, Pennsylvania, by Lieutenant Closson (7). He was a private, in company F (1, 10).
He fought at the Battle of Gettysburg (8).
On 30 December 1863, Sinex reported that he was one of 30 men who had more than fifteen months to serve who were willing to reenlist (4). On 2 January 1864, he was transferred to the 155th Pennsylvania Infantry, while those eligible were on veterans' leave (5).
On 14 April 1891, his mother applied unsuccessfully for a pension (9).
Perhaps he is the John Henry Denning who died on 16 February 1872.
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 letter, Sinex to Marvin, 30 December 1863
3 special order 9, HQ 91st PA, 17 February 1865
4 special order 25, HQ 91st PA, 27 April 1865 (John Denning)
5 consolidated morning report, 91st PA, 2 January 1864 (Denning)
6 company F, register of men discharged (John Denning)
7 company F, descriptive roll, #104 (John H Denning)
8 Pennsylvania Memorial, Gettysburg, Pennsylvania (John H Denning)
9 pension index, by regiment, 91st PA Infantry, company F (John H Denning)
10 index to compiled service records of volunteer Union soldiers who served in organizations from the state of Pennsylvania (John H Denning)