Bates (1) lists two William McGlencey's, one a veteran in company B, who was not on the muster-out roll, and another in company E. I have assumed they are the same person, but have little evidence for that assumption (see 6). Bates also has William McGinsey in company K, who is clearly the William McGlencey in company E.
He was 27 when he enlisted (2, 6, 9 [48 in ?1878]). He was born in Tirone County, Ireland (2, 6, 9).
When he enlisted, he was a teamster (2, 6). He was living in Philadelphia when he was enrolled (6).
He was 5 feet 6-1/2 inches tall, had a light complexion, blue eyes, and light hair (2, 6 [5'8-1/2", light complexion, blue eyes, sandy hair]).
He was enrolled and mustered into service as a private on 16 or 19 September 1861 (1, 6 [19 Sep 61]). He served initially in company B (1, 6).
He was (probably) transferred to company K (10, 12).
He was (probably) transferred to company E on 24 December 1861 (1, 6, 8, see 9, 12).
He fought in the battle of Gettysburg (4), and was wounded there in the right cheek, on 2 July 1863 (2).
He re-enlisted for three years as a veteran volunteer, on 26 March 1864, at Bealton, Virginia (2; 1 (Bates) has 28 March; 6 [30 Mar 64, Warrenton Junction, VA], 10). He was enlisted by Lieutenant Brass, and mustered into service by Captain Barnard (2).
He was reported on a ten-day furlough on 27 April 1864 (7).
On 20 June 1864, he was detailed as a private servant to Major John D Lentz (3).
On 9 March 1865, he went on a furlough, which expired on 24 March 1865 (5). He returned on 27 March 1865 (5).
He mustered out on 10 July 1865 with his company (1, 6, 10). He had served for forty-six months (9).
He applied unsuccessfully for a pension on 13 May 1874 (10, 11).
On 30 April 1878, he was admitted to the National Soldiers Home (9). He had a lung disease, but was not receiving a pension (9).
He died on 8 June 1878, at the Central Branch of the National Soldiers Home (9).
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) (co.K: William M'Ginsey [sic]; co.E: William M'Glencey)
2 descriptive book, company E, entry 86 (William McGlincey)
3 special order 47, headquarters, 91st Pennsylvania Infantry, 20 June 1864
4 Pennsylvania Memorial, 91st Pennsylvania plaque, Gettysburg, Pennsylvania (William McGlency)
5 enlisted men's furloughs (Wm McGlency)
6 Civil War Veterans' Card File, available at the Pennsylvania State Archives, searched 6 May 2004 (Wm McGlencey)
7 consolidated morning report, 91st Pennsylvania, 27 April 1864 (McGlency)
8 company K, list of men transferred, #10 (William McGlincey [?])
9 Annual report of the Board of Managers of the National Soldiers Home, 30 December 1882 [for the fiscal year ending 30 June 1882]. Serial Set volume 2115, session volume 1, 47th Congress, 2nd Session, House Miscellaneous Document 13, page 378 (Wm McGlency)
10 pension index, by regiment, 91st PA Infantry, company E (William McGlency)
11 pension index, by regiment, 91st PA Infantry, company K (William McGlency)
[I did not find an entry for him in the index on <www.ancestry.com> to the pension index by name (searched December 2006)]