On the 4th of December, Captain M'Lane, a vigilant officer on the lines, discovered that an attempt to surprise the American camp at White Marsh was about to be made, and communicated the information to the Commander-in-chief. In the evening of the same day, General Howe marched out of Philadelphia with his whole force; and, about eleven at night, M'Lane, who had been detached with one hundred chosen men, attacked the British van at the Three Mile Run, on the Germantown road, and compelled their front division to change its line of march. He hovered on the front and flank of the advancing army, galling them severely until three next morning, when the British encamped on Chestnut Hill, in front of the American right, and distant from it about three miles. A slight skirmish had also taken place between the Pennsylvania militia under General Irvine, and the advanced light parties of the enemy, in which the general was wounded, and the militia, without much other loss, were dispersed. The range of hills on which the British were posted, approached nearer to those occupied by the Americans, as they stretched northward. Having passed the day in reconnoitring the right, Sir William Howe changed his ground in the course of the night, and moving along the hills to his right, took an advantageous position, about a mile in front of the American left. The next day he inclined still farther to his right, and, in doing so, approached still nearer to the left wing of the American army. Supposing a general engagement to be approaching, Washington detached Gist with some Maryland militia, and Morgan with his rifle corps, to attack the flanking and advanced parties of the enemy. A sharp action ensued, in which Major Morris, of Jersey, a brave officer in Morgan's regiment, was mortally wounded, and twenty-seven of his men were killed and wounded. A small loss was also sustained in the militia. The parties first attacked were driven in; but the enemy reinforcing in numbers, and Washington, unwilling to move from the heights, and engage on the ground which was the scene of the skirmish, declining to reinforce Gist and Morgan, they, in turn, were compelled to retreat. [Sidenote: Returns to Philadelphia.]