Bates has two William Dougherty's enlisted on the same day. The one in company I was not on the muster-out roll. I have assumed they are the same person.
He was born in 1839/40 (2 [22 in 1861], 8 (21 in 1861)). He was born in Philadelphia, Pennsylvania (2).
When he enlisted, he was an engineer, and was living in Philadelphia (2, 8).
When he enlisted, he was 5 feet 6-1/2 inches tall, had a dark complexion, grey eyes, and dark hair (2).
He also served in company C of the 26th Pennsylvania Infantry (13).
He enlisted and was mustered into service in company I on 25 November 1861, at Philadelphia, Pennsylvania (1, 2 [which has co E], 8, 11 [co.E, 24 Nov 1861], 14 (co. E)). At some point, he seems to have transferred to company E (see the note above).
He was one of eleven men captured at the Battle of Fredericksburg, when company E was left behind (2). On 19 May 1863, he (along with eight others) returned to the regiment, as a paroled prisoner (5).
He fought at the battle of Gettysburg (4).
On 30 December 1863, Sinex reported that he was one of 38 men who had less than fifteen months to serve who were unwilling to reenlist (9). On 2 January 1864, he was transferred to the 155th Pennsylvania Infantry, while those eligible were on veterans' leave (10).
On 24 October 1889, he successfully applied for a pension (13).
In 1890, he was living at 2701 Alter Street, Philadelphia, Pennsylvania (11). Matilda Rinick, widow of William Rinick (who served in company E), was also living there.
He died on 11 August 1890 (13).
His widow applied successfully for a pension (13).
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 company E descriptive roll, entry 106 (William Dougherty)
3 company E, register of men discharged, number 32 (William Dougherty)
4 Pennsylvania Memorial, 91st Pennsylvania plaque, Gettysburg, Pennsylvania (Wm Dougherty)
5 consolidated morning report, 91st PA, 19 May 1863 (Private Dougherty)
8 Civil War Veterans' Card File, available at the Pennsylvania State Archives, searched 6 May 2004 (Wm Doughert; the index has two separate cards)
9 letter, Sinex to Marvin, 30 December 1863 (William Dougherty)
10 consolidated morning report, 91st PA, 2 January 1864 (Dougherty)
11 1890 US census, Veterans' schedule, Pennsylvania, Philadelphia, supervisor's district 1, enumeration district 727, page [blank] (William Dougherty)
12 consolidated morning report, 91st Pennsylvania, 26 November 1864 (Privt Dougherty)
13 pension index, by regiment, 91st PA Infantry, company E (William Dougherty)
14 index to compiled service records of volunteer Union soldiers who served in organizations from the state of Pennsylvania (William Dougherty)