The Americans won because the British's commander surrendered Vinennes. It happened in February of 1779.
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The American victory secured the frontier against British incursion, and forced the British to cede the territory to the U.S. at the peace talks.
George Rogers Clark captured Forts Kaskaskia and Vincennes
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The battle of Vincennes toke place in Illinois on Febuary 23, 1779 when George Clark traveled through the Ohio river to get to Vincennes to attack Henry Hamilton, Clark won by have Hamilton surrender by Clark catching them by surprise. George Clark was American and Henry Hamilton was British.
American: George Rogers Clark British: Colonel Henry Hamilton
C. George Rogers Clark