John D. O'BrianHome State: New York
Command Billet: Commanding Regiment
Branch of Service: Infantry
Unit: 24th New York Infantry
In the Antietam Campaign:
In command of the 24th New York Infantry, part of the 1st Brigade of the 1st Division, I Corps. The Regiment was in the lead of the Division during the assault on South Mountain on September 14. Captain O'Brian was specifically commended by General Hatch for his conduct on the field.
He was wounded in action at Antietam. The Brigade advanced through the Cornfield early on the 17th in close support of BGen Gibbon's 4th 'Black Hat' Brigade.
The remainder of the War:
He had a leg amputated from his Antietam wound.
References, Sources, and other notes:
Wound information from State of New York1. Thanks to Devan Sommerville for scrubbing through the AG's report, and extracting and transcribing the roster data for AotW. Photograph here from one at the NY State Military Museum.
1 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 [AotW citation 6219]
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