From History of Allegheny County, Pennsylvania:
Maj. John Irwin, was a native of Ireland, and in 1776, when a young man, he emigrated to America; enlisted in the colonial forces, fought under Gen. Wayne, and was in the Paoli Massacre, where he was nearly killed. He was under Maj. Arnold in the expedition to Quebec; participated in Gen. Wayne's campaign, and was with Gen. Washington at the taking of Yorktown. He was lieutenant and captain, and later was breveted major.Subsequent to the war he lived in Pittsburgh, where he died in 1808. Mr. Irwin was married to Mary Pattison, who became the mother of four children: Mrs. Margaret George, Mrs. Eliza Semple, Dr. W. F. Irwin and John.
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