He was 40 years old when he was enlisted (3).
He was living in Philadelphia when he was enlisted (3).
He was enlisted and mustered into service on 23 or 24 October 1861 (1 [co.D: 24 Oct, co.H: 23 Oct], 3 [23 Oct], 4 [23 Oct]). He was enlisted at Philadelphia, Pennsylvania (3). He was mustered in as a private (3). He served as a private, initially in company H (1).
He was transferred to company D on 4 December 1861 (1, 3, 4).
He was discharged at Washington DC, on 28 April 1863 on surgeon's certificate of disability (1, 2, 3).
On 28 February 1863, he successfully applied for a pension (5).
His widow successfully applied for a pension (5).
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) (William Anderson)
2 company D, register of men discharged, entry 21 (William Anderson)
3 Civil War Veterans' Card File, available at the Pennsylvania State Archives, searched 7 August 2004 (Wm Anderson)
4 company H, register of men transferred (William Anderson)
5 pension index, by regiment, 91st PA Infantry (William Anderson)