Answer: he made his troops surrender and a lot due because he didn’t have their camp in a good enough vantage point.
Explanation: However, lack of Loyalist support made the conquest of Virginia impossible, and Cornwallis instead established his army in an unfortified, low-lying, poor defensive position at Yorktown. He was surprised by the buildup of American and French military and, crucially, naval strength. Besieged by land, he could not be relieved by sea because of the strength of the French navy, and on October 18, 1781, the British army at Yorktown surrendered.