By late September, Patriot-French forces completely surrounded Yorktown, trapped the British army, and prevented British reinforcements from Clinton in the North, while the French Navy was victorious at the Battle of the Chesapeake. The final American offensive was begun with a shot fired by Washington.
The Siege of Yorktown, Virginia was a decisive allied victory by the combined forces of the Continental Army commanded by General Washington, the French Army commanded by the General Comte de Rochambeau, and the French Navy commanded by Admiral de Grasse, in the defeat of Cornwallis' British forces. On August 19, the march to Yorktown led by Washington and Rochambeau began, which is known now as the "celebrated march". Washington was in command of an army of 7,800 Frenchmen, 3,100 militia, and 8,000 Continentals. Lacking in experience in siege warfare, Washington often deferred judgment to Rochambeau, effectively putting him in command; however, Rochambeau never challenged Washington's authority.