James Irwin performs tour of duty by order of Council bearing the date 12 March 1782– 7th Battalion of Cumberland County Militia 8th Company, 2nd Class page 507.

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Pennsylvania Archives Series 5 Volume 6 pages 504-507, Muster Rolls Relating to the Associators and Militia of the County of Cumberland.

An Account of the 2D & 3D Classes of the 7th Battalion of Cumberland County Militia Called upon to perform a tour of duty by an order of Council bearing date the 12th day of March 1782.  8th Company, 2nd Class: James Irwin and Robert Irwin and 3rd Class: Christopher Irwin on page 507