Where was the British fleet all this time?

Its commander, Admiral Hood, had followed sharply after De Grasse, and had outsailed him. Not finding the enemy's fleet in the Chesapeake, he sailed on to New York and reported to Admiral Graves.

Then Sir Henry began to open his eyes to the real state of affairs. All was bustle and hurry. Crowding on all sail, the British fleet headed for the Chesapeake, and there found De Grasse blockading the bay.

It would be all up with Washington's plans if the British fleet should now defeat the French. The French fleet, however, was much the stronger, and Graves was no Nelson. There was a sharp fight for two hours. On the two fleets, the killed and the wounded amounted to seven hundred. The British admiral was then forced to withdraw; and after a few days he sailed back to New York. De Grasse was now in complete control of the Chesapeake.

Cornwallis did not as yet know that Washington was marching at full speed straight for Yorktown. Still, his lordship began to realize that he was fast getting himself into a tight place.

Why not cross the James River and retreat to a safe place in North Carolina?

It was too late. Three thousand French troops had already landed on the neck of the peninsula, and were united with the patriot forces. The "boy" had now more than eight thousand men, with which he could easily cut off every chance for his lordship's retreat.

In the American camp, the combined armies were working with a hearty good will to hasten the siege. There could be no delay. The British fleet was sure to return, and another fleet was hourly expected from England. Again, Sir Henry might at any moment come by sea to the rescue. Day and night the men toiled. Nobody was permitted to speak aloud, for they were close to the British pickets. Intrenchments were made, and cannon were rapidly dragged up and placed in position. By October 10, all was ready.

General Washington in the Trenches before Yorktown