Vaudreuil was on the "Sceptre" in the Battle of the Chesapeake. After one furious engagement with the British navy, Admiral de Grasse's fleet and the British fleet drifted for miles south of Yorktown and lost sight of each other. De Grasse eventually disengaged and returned to the Chesapeake, where he met the fleet of the Comte de Barras. This combined fleet outnumbered the British fleet, and gave the French control of the bay when the British opted not to attack. This had the effect of cutting the army of Cornwallis off from resupply and relief, leading to the Siege of Yorktown and his surrender. Vaudreuil's contribution to this effort was to provide the cavalry of Duke of Lauzun, a foreign legion that was a mix of Russian, Slavic, Polish and German mercenaries in the service of France. He also provided eight hundred men from his ship to Gloucester Point in defence of a peninsula near Yorktown. Together with the Duke of Lauzun these men fought the cavalry of Tarleton, and defeated him.