Edited sentence: French involvement in the war would prove to be exceedingly important during the Siege of Yorktown when 10,800 French regulars and 29 French Warships, under the command of the Comte de Rochambeau and Comte de Grasse respectfully, joined forces with Gen.George Washington and the Marquis de Lafayette to obtain the surrender of Lord Cornwallis's Southern army, and effectively bringing an end fighting on the North American mainland for the remainder of the war