Who was the french navy admiral who helped defeat conrwallis?

The French navy admiral who played a crucial role in defeating General Cornwallis during the American Revolutionary War was Admiral François Joseph Paul de Grasse. He commanded the French fleet at the Battle of Yorktown in 1781, where his naval support helped secure a decisive victory for the American and French forces. De Grasse's strategic blockade prevented British reinforcements from reaching Cornwallis, ultimately leading to Cornwallis's surrender.