by De Grasse's arrival; this prevented the British in New York from learning the full strength of de Grasse's fleet until it was too late. British Admiral George Brydges Rodney, who had been tracking De Grasse around the West Indies, was alerted to the latter's departure, but was uncertain of the French admiral's destination. Believing that de Grasse would return a portion of his fleet to Europe, Rodney detached Rear Admiral Sir Samuel Hood with 14 ships of the line and orders to find de Grasse's destination in North America. Rodney, who was ill, sailed for Europe with the rest of his fleet in order to recover, refit his fleet, and to avoid the Atlantic hurricane season. Sailing more directly than de Grasse, Hood's fleet arrived off the entrance to the Chesapeake on 25 August. Finding no French ships there, he then sailed for New York. Meanwhile, his colleague and commander of the New York fleet, Rear Admiral Sir Thomas Graves, had spent several weeks trying to intercept a convoy organized by John Laurens to bring much-needed supplies and hard currency from France to Boston. When Hood arrived at New York, he found that Graves was in port (having failed to intercept the convoy), but had only five ships of the line that were ready for battle. De Grasse had notified his counterpart in Newport, Barras, of his intentions and his planned arrival date. Barras sailed from Newport on 27 August with 8 ships of the line, 4 frigates, and 18 transports carrying French armaments and siege equipment. He deliberately sailed via a circuitous route in order to minimize the possibility of a battle with the British, should they sail from New York in pursuit. Washington and Rochambeau, in the meantime, had crossed the Hudson on 24 August, leaving some troops behind as a ruse to delay any potential move on the part of General Clinton to mobilize assistance for Cornwallis. News of Barras' departure led the British to realize that the Chesapeake was the probable target of the French fleets. By 31 August, Graves had moved his five ships of the line out of New York Harbor to meet with Hood's force. Taking command of the combined fleet, now 19 ships, Graves sailed south, and arrived at the mouth of the Chesapeake on 5 September. His progress was slow; the poor condition of some of the West Indies ships