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Federal (USV)


Thomas O'Leary

(c. 1829 - ?)

Home State: Pennsylvania

Branch of Service: Infantry

Unit: 111th Pennsylvania Infantry

Before Antietam

A 32 year old laborer, he enlisted on 18 October 1861 in Erie, PA and mustered into service as Private, Company H, 111th Pennsylvania Infantry on 2 November 1861.

On the Campaign

He was present in action with his Company at Antietam on 17 September 1862.

The rest of the War

He was ill with Rheumatism at a US Army hospital in Frederick, MD from 15 January to 10 March 1863, then sent on to Baltimore. He returned to duty, date not given, and was discharged at the expiration of his term on 9 February 1864.

References & notes

Basic service information from Bates.1 His sick time from the Patient List.2 Further details from the Company H Descriptive Book in the US National Archives, transcribed and provided by Patrick Knierman.


c. 1829; County Cork, IRELAND


1   Bates, Samuel Penniman, History of the Pennsylvania Volunteers, 1861-65, Harrisburg: State of Pennsylvania, 1868-1871, Vol. III, pg. 1050  [AotW citation 21698]

2   National Museum of Civil War Medicine, and Terry Reimer, Frederick Patient List, Published 2018, first accessed 17 September 2018, <>, Source page: patient #1.356  [AotW citation 21699]