General Wayne and Marquis de Lafayette
french
The French, led by Comte De Rochambeau.
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Sumter helped get Cornwallis out of the Carolinas, leading to Cornwallis' eventual defeat in Yorktown.
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The admiral that helped trap General Lord Cornwallis at the Siege of Yorktown was Comte (or admiral) de Grasse.
Von Steuben put his book knowledge on artillery to practice. Lafayette was a major officer who, despite his young age, helped Washington corner Cornwallis. There were others.
George washing and his troops trapped Cornwallis's troop on a peninsula in Charleston. They had no way to escape.
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France helped George Washington defeat the British at Yorktown.