High Quality Content by WIKIPEDIA articles! The Siege of Yorktown, Battle of Yorktown, or Surrender of Yorktown in 1781 was a decisive victory by a combined assault of American forces led by General George Washington and French forces 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, as the surrender of Cornwallis` army prompted the British government eventually to negotiate an end to the conflict.