The reverse had brought consternation at New York. Lord Cornwallis was about to embark for England, the bearer of news of overwhelming victory. Now, instead, he was sent to drive back Washington. It was no easy task for Cornwallis to reach Trenton, for Washington's scouting parties and a force of six hundred men under Greene were on the road to harass him. On the evening of the 2d of January, however, he reoccupied Trenton. This time Washington had not recrossed the Delaware but had retreated southward and was now entrenched on the southern bank of the little river Assanpink, which flows into the Delaware. Reinforcements were following Cornwallis. That night he sharply cannonaded Washington's position and was as sharply answered. He intended to attack in force in the morning. To the skill and resource of Washington he paid the compliment of saying that at last he had run down the "Old Fox." Then followed a maneuver which, years after, Cornwallis, a generous foe, told Washington was one of the most surprising and brilliant in the history of war. There was another "old fox" in Europe, Frederick the Great, of Prussia, who knew war if ever man knew it, and he, too, from this movement ranked Washington among the great generals. The maneuver was simple enough. Instead of taking the obvious course of again retreating across the Delaware Washington decided to advance, to get in behind Cornwallis, to try to cut his communications, to threaten the British base of supply and then, if a superior force came up, to retreat into the highlands of New Jersey. There he could keep an unbroken line as far east as the Hudson, menace the British in New Jersey, and probably force them to withdraw to the safety of New York.