Jean-Joseph Sourbader de Gimat was part of a war in Yorktown Virginia with American and French allies that ended on what date?
Jean-Joseph Sourbader de Gimat:  He led his men in a successful assault at Yorktown that same year. Siege of Yorktown: The Siege of Yorktown, also known as the Battle of Yorktown, the Surrender at Yorktown, German Battle or the Siege of Little York, ending on October 19, 1781, at Yorktown, Virginia, was a decisive victory by a combined force of American Continental Army troops led by General George Washington and French Army troops led by the Comte de Rochambeau over a British Army commanded by British peer and Lieutenant General Charles Cornwallis.
October 19, 1781