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Major General John Sullivan, by Thomas Hart, 1776.
Credit: Library of Congress
In the summer of 1779, Sullivan led the Continental Army's only major offensive operation against Native Americans during the Revolutionary War. His force of 2,500 men marched north through the Susquehanna Valley into New York, where it conducted a scorched-earth campaign against the Seneca and Cayuga nations of the Iroquois confederacy.