What was the battle in which Admiral de Grasse defeated the British ships?

The battle in which Admiral de Grasse defeated the British ships was the Battle of the Chesapeake, fought on September 5, 1781. This naval engagement was crucial during the American Revolutionary War, as it prevented British reinforcements from reaching General Cornwallis's forces at Yorktown. De Grasse's victory helped secure American and French control of the waters, leading to the eventual surrender of Cornwallis and a significant turning point in the war.