Earlier, in a stroke of luck for the Patriots, the French fleet commanded by Francois, Count de Grasse, departed St. Domingue (the then-French colony that is now Haiti) for the Chesapeake Bay, just as Cornwallis chose Yorktown, at the mouth of the Chesapeake, as his base. Washington realized that it was time to act. He ordered Marquis de Lafayette and an American army of 5,000 troops to block Cornwallis’ escape from Yorktown by land while the French naval fleet blocked the British escape by sea. By September 28, Washington had completely encircled Cornwallis and Yorktown with the combined forces of Continental and French troops. After three weeks of non-stop bombardment, both day and night, from cannon and artillery, Cornwallis surrendered to Washington in the field at Yorktown on October 17, 1781, effectively ending the War for Independence.
Pleading illness, Cornwallis did not attend the formal surrender ceremony, held on October 19. Instead, his second in command, General Charles O’Hara, carried Cornwallis’ sword to the American and French commanders.
Although the war persisted on the high seas and in other theaters, the Patriot victory at Yorktown ended fighting in the American colonies. Peace negotiations began in 1782, and on September 3, 1783, the Treaty of Paris was signed, formally recognizing the United States as a free and independent nation after eight years of war.