Video Siege of Yorktown-National Park Video. Leaders of Battle of Yorktown. George Washington- General of the Continental ArmyComte de Rochambeau-Commander of the French Army sent by King Louis XVIGeneral Charles Lord Cornwallis- Commander of the British Army. Timeline of Battle. 1777-1778- Valley Forge- George Washington is suffering defeats and desertions. Summer 1780- The French, led by Comte Rochambeau arrive to help the Americans defeat the British..