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Federal (USV)


Thomas O'Brien

(? - 1862)

Home State: New York

Branch of Service: Infantry

Unit: 69th New York Infantry

Before Antietam

He was Private, 5th (NY?) Infantry and transferred to Company D, 69th New York Infantry, date not given.

On the Campaign

He was mortally wounded in the right leg, with a broken tibia, in action at Antietam.

The rest of the War

He was treated at a hospital in Frederick, MD where his leg was amputated in the upper third on 19 September. He died there of wounds on 4 October 1862.

References & notes

Burial information from the History.1 Service information from the Roster2, which says that his wound was on South Mountain (9/14) and that he was discharged for disability in Frederick on 6 March 1863. Amputation and death details from Nelson.3 His gravesite is on Findagrave.


10/04/1862; Frederick, MD; burial in Antietam National Cemetery, Sharpsburg, MD


1   Antietam National Cemetery, Board of Trustees, History of Antietam National Cemetery, Baltimore: John W. Woods, Steam Printer, 1869  [AotW citation 3991]

2   State of New York, Adjutant-General, Annual Report of the Adjutant General of the State of New York [year]: Registers of the [units], 43 Volumes, Albany: James B. Lyon, State Printer, 1893-1905, For the Year 1901, Ser. No. 28, pg. 271  [AotW citation 17958]

3   Nelson, John H., As Grain Falls Before the Reaper: The Federal Hospital Sites and Identified Federal Casualties at Antietam, Hagerstown: John H. Nelson, 2004, pg. 340  [AotW citation 17959]