He was 30 years old when he enlisted in 1861 (4). He was born in Philadelphia, Pennsylvania (4).
He was a glass blower (4).
He was 5 feet 6 inches tall, and had a dark complexion, dark eyes, and dark hair (4).
He enlisted and was mustered into service on 26 or 27 November 1861 (1, 4 [27 Nov]). He was enlisted for three years, at Philadelphia, Pennsylvania, by Lieutenant Parsons (4). He initially served in company G (1). He served as a private (1).
He was transferred on 4 December 1861 to company A (1, 6).
He was discharged at camp near Falmouth, Virginia, on 21 March 1863, on surgeon's certificate of disability (1, 2, 3, 4). He was then a private (1, 3).
On 28 October 1867, his mother, Anna Simpson, applied successfully for a pension (5, 7).
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 consolidated morning report, 91st PA, 21 March 1863 (Robert Simpson)
3 Register of men discharged, co.A (Robert Simpson) (although this has Simpson discharged on 21 March 1862, the year is obviously wrong)
4 company A descriptive roll, entry 77 (Robert Simpson)
5 pension index, by regiment (Robert Simpson)
6 company G, register of men transferred (Robert Simpson)
7 pension index, by name (Robert Simpson)
[I did not find an entry for him in the index on <www.ancestry.com> to the 1890 veterans census (searched October 2005)]