Up to this point all the movements of the French and Americans had convinced Clinton that an attack would 15 soon be made against New York. Never for a moment did he imagine that his opponent would dare leave the Hudson unguarded and throw his whole army against Cornwallis. The risk of losing West Point and the difficulty of covering the hundreds of miles that lay between New York and Yorktown seemed to forbid any such maneuver. Nevertheless, this was precisely what Washington intended to do, and within a few days after the receipt of de Grasse's message he was hurrying southward with every man he could 5 possibly spare.
Secrecy and speed were essential to success, for if Clinton discovered what was happening, he would undoubtedly try to throw his army between Cornwallis and the Americans, and even though he failed in stopping them he could 10 easily delay their march until the British force at Yorktown had time to escape. Washington, therefore, took extraordinary care to conceal his plans, not only from his foes but also from his friends. Indeed, Rochambeau was the only officer who knew where the men were being headed as 15 they hurried through New Jersey, and so cleverly was their route selected that even when Clinton learned of their march he still believed that the Americans, having failed in the attempt on his rear door near King's Bridge, were about to swing around and try to get in at the front door 20 from Staten Island or Sandy Hook.
This was just what Washington wanted him to think, and to deceive him still further, camp kitchens were erected along the expected line of march and the troops were so handled that they seemed to be moving straight to an 25 attack on New York. But at the proper moment they were suddenly turned southward at a pace that defied pursuit, and before the true situation dawned on the British commander they were almost at the Delaware River. But though he had by this time acquired a fairly safe lead, 30 Washington did not slacken his speed, and with a roar of cheers from the now excited populace, the dusty columns were soon pouring through Philadelphia, the American commander pushing on ahead to Chester, and sending back word that de Grasse had arrived in Chesapeake Bay and that not a moment must be lost.