Because he did not have enough provisions to stand the siege.
Explanation:
- The battle was a classic siege, in which day by day the hoops around Cornwallis were tightening.
- After an initial trench in which Americans and French were stationed, a multi-day cannon exchange of fire favored the French, who had stronger and better cannons than the British.
- On October 11, the Americans set out to make a second trench, which is now much closer to the very fortification of the British, while on October 12, Cornwallis sends a dispatch that he cannot stand the siege for long.
- On October 14, a new trench was located 140 meters from the British army stationed in front, there was no moonlight that night, and again a small British-German army was attacked in front of the Washington-led army.
Learn more on Battle of Yorktown on
https://brainly.com/question/1086324
https://brainly.com/question/277450
https://brainly.com/question/2114485
#learnwithBrainly
