He was 27 years old when he was enlisted (6). He was born in Philadelphia, Pennsylvania (6).
He was 5 feet 5-1/2 inches tall, and had a fair complexion, blue eyes, and sandy hair (6). He had marks from smallpox (6).
He was enlisted and mustered into service on 20 August 1861 (1, 6, 7). He was enlisted for three years, at Philadelphia, Pennsylvania, by Colonel Reiff (6, 7 [Lt Col]). He served in company C as a private (1).
He was wounded on 3 May 1863 at Chancellorsville, Virginia (1). On 7 May 1863, he may have been reported missing in action (2 [see my note below]). If so, he had been captured, and was reported in Camp Parole, Maryland, on 21 May 1863 (3).
On 9 June 1863, he or William Simpson was detailed for duty at Division Headquarters (4).
He fought at the Battle of Gettysburg (8).
He mustered out when his term expired, near Petersburg, Virginia, on 5 December 1864 (1) or 20 September 1864 (5, 6).
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) (Samuel C Simpson)
2 consolidated morning report, 91st PA, 7 May 1863
(Corpl Simpson)
[This may be William Simpson.
According to Bates, Samuel Simpson was wounded at Chancellorsville, but was a private when he mustered out; the only Corporal Simpson (C) Bates lists is William H Simpson.]
3 consolidated morning report, 91st PA, 21 May 1863 (Corpl Simpson; see my note on #2 above)
4 consolidated morning report, 91st PA, 9 June 1863 (Pri [?] Simpson)
5 company C, register of men discharged, number 34 (Samuel C Simpson)
6 company C, descriptive roll, entry 64 (Samuel C Simpson)
7 company C, untitled list, probably of status at muster out, entry 55 (Saml C Simpson)
8 Pennsylvania Memorial, Gettysburg, Pennsylvania (S C Simpson)
[I did not find an entry for him in the index on <www.ancestry.com> to the pension index by name (searched April 2007)]