An expedition against hostile Indian nations checked the aggressions of English and Indians on the frontiers of New York and Pennsylvania and extended westward the dominion of the United States. Near this point in August 1779, the brigade of Continental forces under General James Clinton, proceeding from Canajoharie to join the main army of General John Sullivan at Tioga (Athens, Penn), was met by a detachment of one thousand men under General Enoch Poor sent up the Susquehanna River to meet Clinton and ensure the safety of his march.