The final act in the mighty drama was now approaching. From the Potomac to the confines of Florida the Southland was aroused against the British as it never could have been aroused except for the barbarities which Cornwallis perpetrated and sanctioned. The British commander was behind the intrenchments at Yorktown with an army of about eight thousand men and a horde of Tories who had been willing agents in carrying out against their own countrymen the atrocious decrees which for a time made a Poland of the Carolinas. Sir Henry Clinton, thoroughly deceived by the movements of Washington and Rochambeau, was anxious only to protect New York, and the victorious fleet of France was prepared to cut off the escape of Cornwallis by the sea. Washington and Rochambeau, with the allied armies, marched against Yorktown from their rendezvous at Williamsburg on September 28. They drove in the British outposts, and began siege operations so promptly and vigorously that the place was completely invested on the thirtieth by a semi-circular line of the allied forces, each wing resting on the York River. The Americans held the right; the French the left. A small body of British at Gloucester, opposite Yorktown, was beset by a force consisting of French dragoons and marines, and Virginia militia. Heavy ordnance was brought from the French ships, and on the afternoon of October 9, the artillery opened on the British. Red-hot balls were hurled upon the British vessels in the river, and the flames shooting up from a 44-gun ship showed that fire was doing its work. Under cover of night parallels were thrown up closer and closer to the British lines, and the besieged saw the chain which they could not break tightening around them. The Americans and French carried by storm two redoubts which commanded the trenches, and now Cornwallis had to take his choice between flight or surrender, if flight were possible. He determined to flee, but a terrible storm made the passing of the river too dangerous, and a few troops who had crossed over were brought back to Yorktown.