He was born in 1838/39 (5 (22 in 1861)).
He enlisted and was mustered into service, at Philadelphia, Pennsylvania, on 10 October 1861 (1, 5 [10 Nov]). He was mustered in as a private, in company F (1, 5, 7-8).
He was promoted to corporal (5).
He deserted on 20 November 1861, from Camp Chase, Philadelphia (1, 2, 3). He was a corporal, in company F (1, 7-8).
He was transferred to company D on 4 December 1861 (1, 5, 6; see also 7-8).
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) (Thomas McGuinn or McGwinn)
2 company D, register of deserters (Thomas McGuinn)
3 company D, register of deserters (Thomas McQuinn [sic])
4 Civil War Veterans' Card File, available at the Pennsylvania State Archives, searched 27 July 2004 (Thomas McGuinn [co. F]--the card merely refers to the company D card)
5 Civil War Veterans' Card File, available at the Pennsylvania State Archives, searched 7 August 2004 (Thomas McGwinn)
6 company F, register of men transferred (Thomas McGuinn)
7 index to compiled service records of volunteer Union soldiers who served in organizations from the state of Pennsylvania (Thomas McGinn)
8 index to compiled service records of volunteer Union soldiers who served in organizations from the state of Pennsylvania (Thomas McGuinn)