What happened at Yorktown that allowed the American Continental army to win the war?

September 1781 - October 19, 1781. The battle of Yorktown began late in September 1781. The British General sent pleas for troop reinforcements and even considered ferrying his men across the river to safety. The French and Americans began a long bombardment, with the French artillery proving highly accurate.

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, 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.