During the night of September 5-6, the two fleets remained close together. At a conference on the _London_, on the 6th, Graves decided that with a number of his ships disabled it would be too hazardous to renew the action. He also declined Hood’s suggestion to try to slip into the Chesapeake. De Grasse, having stopped the British and having inflicted considerable damage, likewise hesitated to renew the engagement. On the 7th and 8th, the two fleets remained from 2 to 5 leagues apart. Meanwhile, a northeast wind was carrying them south. On the 9th, they were below Albemarle Sound, and by the next day the British fleet was off Cape Hatteras. It was on the 9th that De Grasse lost sight of the British and, fearing that a change of wind might prevent it, sailed toward the Chesapeake Bay, which he reached on the 11th. On the 10th, De Barras reached Virginia with his squadron from Newport, R. I., and entered the bay, later to join De Grasse. Admiral Graves followed De Grasse northward, realizing that the situation was now out of hand. On September 14, he sailed from the Virginia coast for New York, where he intended to “... use every possible means for putting the Squadron into the best state for service....” His departure had momentous consequences for Cornwallis. The Battle of the Virginia Capes, as the action of September 5 has come to be called, was a most important phase of the siege of Yorktown. At a critical point the French had seized control of the sea and had sealed in the British at Yorktown. This prevented the evacuation of Cornwallis and ended his hopes of reinforcement and supply. The next phase of the combined operation against Cornwallis was encirclement by land. Already this was being accomplished. ASSEMBLY OF THE ALLIED ARMIES. On September 7, Lafayette moved his force from the Pamunkey River to Williamsburg where he could at least temporarily block any movement that Cornwallis might make up the peninsula. His army was substantially enlarged the next day by the more than 3,000 troops under St. Simon, who had arrived with De Grasse and landed at Jamestown. On September 14, Washington arrived at Lafayette’s headquarters in Williamsburg for a “joyful reunion” with the young French general and to assume direct command of the operations in the Virginia theater. The combined French and American forces, which Washington had left at the head of the Chesapeake early in September, found a shortage of shipping also at Head-of-Elk. It was necessary to use most of the vessels available for the transport of ordnance and stores, with the result that the bulk of the troops had to march on to Baltimore and Annapolis to embark. On September 15, Washington wrote to De Grasse about the transport of his army. The French admiral had anticipated this need, and had already dispatched the transports brought to the area from Newport by De Barras plus some frigates which had been seized—enough to accommodate about 4,000 troops.