He was born in Lewistown, Delaware (5, 7, 8). He was 19 years old when he was enlisted (5, 7, 8).
He was a farm[er] when he was enlisted (5, 7, 8).
He was 5 feet 3 inches tall, and had a light complexion, grey eyes, and light hair (5, 7).
He was enlisted and mustered into service on 4 November 1861 (1, 5, 6). He was enlisted for three years, at Philadelphia, Pennsylvania, by Captain Casner (5). He was mustered in as a private in company K, by Lieutenant Francis Gregory (1, 5).
He fought at the Battle of Gettysburg (9).
He reenlisted as a veteran volunteer on 26 December 1863 (1, 7 [26 Dec 64], 8). He was enlisted for three years, at Bealton, Virginia, by Lieutenant Carpenter (7, 8). He was mustered in by Lieutenant Swan (7, 8).
On 23 September 1864, he was detailed by Eli Sellers for duty with the brigade provost guard (2, 4).
On 27 April 1865, he was promoted to corporal, effective 1 April 1865 (1, 3, 6).
He mustered out on 10 July 1865 with his company (1).
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) (P Hardenbaugh)
2 special order 81, HQ 91st PA, 23 September 1864 (Peter Herdenbaugh)
3 special order 25, HQ 91st PA, 27 April 1865 (Peter Herdenbaugh)
4 [list of detailed men, probably from Sept 1864] (Peter Hardenbaugh [?])
5 company K, descriptive roll (Peter Hardenbaugh)
6 company K, second list of non-commissioned officers (Peter Herdenbaugh)
7 company K, third descriptive roll (Peter Herdenbaugh [sic])
8 company K, fourth descriptive roll (Peter Herdenbaugh)
9 Pennsylvania Memorial, Gettysburg, Pennsylvania (P Hardenbaugh)
[I did not find an entry for him in the index on <www.ancestry.com> to the pension index by name (searched March 2007)]
[I did not find an entry for him in the index on <www.ancestry.com> to the 1890 veterans' census (searched March 2007)]