Pittsburgh, Pa., to Thomas Mif[f]lin, [Philadelphia], Pa
April 14, 1791, letter from John Irwin, then a major in the 4th battalion of the Allegheny County militia who was acting for the county lieutenant, to Pennsylvania governor Thomas Mifflin, regarding the defense of the Pittsburgh-Allegheny County frontier against Indian attacks which followed Gen. Harmar's defeat the previous fall.
"April 14, 1791, letter from John Irwin, then a major in the 4th battalion of the Allegheny County militia who was acting for the county lieutenant, to Pennsylvania governor Thomas Mifflin, regarding the defense of the Pittsburgh-Allegheny County frontier against Indian attacks which followed Gen. Harmar's defeat the previous fall."@en
Edward E. Ayer Manuscript Collection (Newberry Library)
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