In July 1780 France's Louis XVI had sent to America an expeditionary force of 6,000 men under the Comte Jean de Rochambeau. In addition, the French fleet harassed British shipping and prevented reinforcement and resupply of British forces in Virginia by a British fleet sailing from New York City. French and American armies and navies, totaling 18,000 men, parried with Cornwallis all through the summer and into the fall. Finally, on October 19, 1781, after being trapped at Yorktown near the mouth of Chesapeake Bay, Cornwallis surrendered his army of 8,000 British soldiers.