The situation was indeed a very dangerous one; but when the British general called his antagonist an old fox, he did him no more than justice. In its union of slyness with audacity, the movement which Washington now executed strongly reminds one of "Stonewall" Jackson. He understood perfectly well what Cornwallis intended to do; but he knew at the same time that detachments of the British army must have been left behind at Princeton and New Brunswick to guard the stores. From the size of the army before him he rightly judged that these rear detachments must be too small to withstand his own force. By overwhelming one or both of them, he could compel Cornwallis to retreat upon New York, while he himself might take up an impregnable position on the heights about Morristown, from which he might threaten the British line and hold their whole army in check,--a most brilliant and daring scheme for a commander to entertain while in such a perilous position as Washington was that night! But the manner in which he began by extricating himself was not the least brilliant part of the manoeuvre. All night long the American camp-fires were kept burning brightly, and small parties were busily engaged in throwing up intrenchments so near the Assunpink that the British sentinels could plainly hear the murmur of their voices and the thud of the spade and pickaxe. While this was going on, the whole American army marched swiftly up the south bank of the little stream, passed around Cornwallis's left wing to his rear, and gained the road to Princeton. Toward sunrise, as the British detachment was coming down the road from Princeton to Trenton, in obedience to Cornwallis's order, its van, under Colonel Mawhood, met the foremost column of Americans approaching, under General Mercer. As he caught sight of the Americans, Mawhood thought that they must be a party of fugitives, and hastened to intercept them; but he was soon undeceived. The Americans attacked with vigour, and a sharp fight was sustained, with varying fortunes, until Mercer was pierced by a bayonet, and his men began to fall back in some confusion. Just at this critical moment Washington came galloping upon the field and rallied the troops, and as the entire forces on both sides had now come up the fight became general. In a few minutes the British were routed and their line was cut in two; one half fleeing toward Trenton, the other half toward New Brunswick. There was little slaughter, as the whole fight did not occupy more than twenty minutes. The British lost about 200 in killed and wounded, with 300 prisoners and their cannon; the American loss was less than 100. [Portrait: Hugh Mercer] [Sidenote: General retreat of the British toward New York]