General Howe had now completed a line of defence from the Schuylkill to the Delaware; and a reinforcement from New York had arrived at Chester. These two circumstances enabled him to form an army in the Jerseys sufficient for the reduction of fort Mercer, without weakening himself so much in Philadelphia as to put his lines in hazard. Still deeming it of the utmost importance to open the navigation of the Delaware completely, he detached Lord Cornwallis about one in the morning of the 17th, with a strong body of troops to Chester. From that place, his lordship crossed over to Billingsport, where he was joined by the reinforcement from New York. {November 17.} General Washington received immediate intelligence of the march of this detachment, which he communicated to General Varnum with orders that fort Mercer should be defended to the last extremity. With a view to military operations in that quarter, he ordered one division of the army to cross the river at Burlington, and despatched expresses to the northern troops who were marching on by brigades, directing them to move down the Delaware on its northern side until they should receive farther orders. [Sidenote: Fort Mercer evacuated.] Major General Greene, an officer who had been distinguished early in the war by the Commander-in-chief for the solidity of his judgment and his military talents, was selected for this expedition. A hope was entertained that he would be able, not only to protect fort Mercer, but to obtain some decisive advantage over Lord Cornwallis; as the situation of the fort, which his lordship could not invest without placing himself between Timber and Manto Creeks, would expose the assailants to great peril from a respectable force in their rear. But, before Greene could cross the Delaware, Lord Cornwallis approached with an army rendered more powerful than had been expected by the junction of the reinforcement from New York; and fort Mercer was evacuated. A few of the smaller galleys escaped up the river, and the others were burnt by their crews. Washington still hoped to recover much of what had been lost. A victory would restore the Jersey shore, and this object was deemed so important, that General Greene's instructions indicated the expectation that he would be in a condition to fight Lord Cornwallis. That judicious officer feared the reproach of avoiding an action less than the just censure of sacrificing the real interests of his country by engaging the enemy on disadvantageous terms. The numbers of the British exceeded his, even counting his militia as regulars; and he determined to wait for Glover's brigade, which was marching from the north. Before its arrival, Lord Cornwallis took post on Gloucester Point, a point of land making deep into the Delaware, which was entirely under cover of the guns of the ships, from which place he was embarking his baggage and the provisions he had collected for Philadelphia.[73]