The Sullivan Expedition was a United States military campaign ordered by George Washington in response to the Iroquois and Loyalist destruction of American settlements in the Wyoming Valley and Cherry Valley. The campaign targeted the four British-allied nations of the Iroquois Confederacy and aimed at "the total destruction and devastation of their settlements." This scorched-earth strategy reflected the escalating conflict between American forces and their Native American adversaries during the Revolutionary War.
General John Sullivan commanded the expedition, which lasted from June to October 1779 and involved four Continental Army brigades operating in the territory of the Iroquois Confederacy in what is now central New York. The campaign systematically destroyed Iroquois villages, crops, and food stores across the region.
The expedition proved largely successful in its destructive objectives. Forty Iroquois villages were razed, and the destruction of crops and food stores forced just over 5,000 Iroquois to seek refuge at Fort Niagara under British protection. The campaign effectively depopulated the area, which facilitated American settlement in the post-war period. However, the nature and scale of the destruction remain historically contested—some scholars characterize the campaign as an attempt to annihilate the Iroquois and describe it as genocide, though this designation remains disputed among historians.
The American Revolutionary War (1775–1783) grew from colonial resistance to British taxation without parliamentary representation — a dispute that radicalized through the Stamp Act (1765), the Townshend Acts (1767), and the Boston Massacre (1770). Fighting began at Lexington and Concord in April 1775; the Continental Congress declared independence on July 4, 1776. The Continental Army under George Washington faced severe shortages of supplies and troops, enduring the brutal winter at Valley Forge (1777–1778) before French alliance and French financing turned the military balance. Major engagements included Bunker Hill (1775), Trenton (1776), Saratoga (1777) — which secured French intervention — and Yorktown (1781), where British General Cornwallis surrendered to Washington. An estimated 25,000 American soldiers died in service, from combat, disease, and captivity. The Treaty of Paris (1783) recognized American independence and ceded British territory east of the Mississippi, though it left unresolved questions about Indigenous land rights and the status of Loyalists.
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