The Siege of Yorktown, or Surrender of Yorktown, the latter taking place on October 19, 1781, was a decisive victory by a combined force of American Continental Army troops led by General George Washington and French Army troops led by the Comte de Rochambeau over a British Army commanded by Lieutenant General Lord Cornwallis. The culmination of the Yorktown campaign, it proved to be the last major land battle of the American Revolutionary War in North America.

French and American armies united north of New York City during the summer of 1781, moving south toward Virginia. The Comte de Grasse arrived at the Chesapeake Bay at the end of August, bringing troops and providing a naval blockade of Yorktown, after which the Americans and French built their first parallel and began the bombardment. With the British defense weakened, on October 14, 1781 Washington sent two columns to attack the last major remaining British outer defenses. The British situation began to deteriorate rapidly and Cornwallis asked for capitulation terms on the 17th. The surrender ceremony took place on the 19th; Lord Cornwallis, claiming to be ill, was absent from the ceremony. Negotiations between the United States and Great Britain began, resulting in the Treaty of Paris in 1783.