(? - 1886)
Home State: Pennsylvania
Command Billet: Brigade Commander
Branch of Service: Infantry
see his Battle Report
Summary of service: Served in the Mexican War (1847-8) and was brevetted for bravery. Enlisted at Wars' beginning as Private, Logan's (PA) Guard. Was then Colonel of the 7th (Three-Month's Service) and most recently 49th Pennsylvania Infantry, which he led on the Peninsula Campaign. Col Irwin was appointed Brigade Commander just at the start of the Maryland Campaign.
The rest of the War
He resigned his commission October 24, 1863.
References & notes
Source: Heitman, Francis Historical Register and Dictionary of the United States Army 1789-1903, Washington, US Government Printing Office, 1903.
Date not known in PA