On the night of October 14, 1781 the British occupied this heavily fortified redoubt (a supplemental fort) anchoring the eastern end of their defensive line close to the river. Two attack forces were assembled for an early evening attack: one French and one American led by Alexander Hamilton. Together the plan was to simultaneously attack the redoubts under cover of darkness in hopes their movement would take the British off guard.
At 8:00 p.m. a French force advanced in columns towards Redoubt #9. The assault would be over in less than 30 minutes. Seventy-seven French were wounded and 15 killed. The British and Germans lost 18 killed and 50 men were taken, prisoner.
Not wanting to give away their position, at the same time as the French assault began, the Americans began their assault on Redoubt #10 with unloaded weapons. Without waiting for the the abatis to be cut down, the Americans crossed over the ditch surrounding the redoubt and swarmed over the parapets. In just 10 minutes they successfully overcame the British holding the position. Nine men were killed and 31 wounded.
As soon as both redoubts were captured, work began extending the second parallel. By the next day the parallel had reached the captured redoubts. Cornwallis realized the position that he was now hopeless. This is where the American Revolutionary War was won!