The news of Trenton alarmed the British, and Lord Cornwallis with seven thousand of the best troops started at once from New York in hot pursuit of the American army. Washington, who had now rallied some five thousand men, fell back, skirmishing heavily, behind the Assunpink, and when Cornwallis reached the river he found the American army awaiting him on the other side of the stream. Night was falling, and Cornwallis, feeling sure of his prey, decided that he would not risk an assault until the next morning. Many lessons had not yet taught him that it was a fatal business to give even twelve hours to the great soldier opposed to him. During the night Washington, leaving his fires burning and taking a roundabout road which he had already reconnoitered, marched to Princeton. There he struck another British detachment. A sharp fight ensued, the British division was broken and defeated, losing some five hundred men, and Washington withdrew after this second victory to the highlands of New Jersey to rest and recruit.