At this time, more than half of the enlistments of the army were on their extreme limit of service. Howe promised the militia of New York, many of whom were in the garrison of the fort, that “he would guarantee to them their liberties and properties, as well as a free and general pardon.” Many decided not to reënlist. On the ninth of November, having in mind the eventualities of a New Jersey campaign, Washington moved one division of the army across the Hudson at Peekskill, and ordered a second to move the day following. On the tenth he placed General Lee in charge of the general camp, with careful instructions as to the discipline of the men; and notified him, in case the enemy should remove the whole or the greater part of their force to the west side of the Hudson, to follow with all possible despatch, leaving the militia to cover the frontiers of Connecticut, in case of need.

On the eve of his own departure he also notified Governor Trumbull of Connecticut, that “the campaign into New Jersey would withdraw Lee and his division from the Hudson”; and made arrangements for the “care and storage for the winter, of all tents and stores that might remain on hand after the discharge of enlisted men whose term should expire.”

The following terse order was then issued to all the divisions which were to accompany him in this, his “First New Jersey campaign”:

“Colonels will examine the baggage of troops under marching orders; tents and spare arms, to go in the first wagons, then the proper baggage of the regiment; no chairs, tables, or heavy chests, or personal baggage, to be put in, as it will certainly be put off and left. No officer of any rank to meddle with a wagon or a cart appropriated for any other regiment, or use; that no discharged man be allowed to carry away arms, camp kettles, utensils, or any other public stores; recruiting officers, as detailed, to proceed with their duty; no boys, or old men, to be enlisted, and if so, to be returned at the hands of the officer, with no allowance for any expense he may be at.”

On the twelfth of November, before crossing the Hudson River, Washington placed General Heath in command of the Highlands, and proceeded to Fort Lee, opposite Fort Washington. The British army had already removed from Dobb’s Ferry to King’s Bridge. At this time, three hundred British transports with a large force on board, lay at Sandy Hook, and their destination was suspected to be either Newport, Rhode Island, Philadelphia, or South Carolina.

Washington established his headquarters about nine miles from Fort Lee. It is not desirable to burden the narrative with the details of the capture of Fort Washington. The fort had been built to control the river, and it was weak, landward; depending upon the river, even for water, having no well. The ground fell off rapidly; but there were neither trenches nor regular bastions, and only one redoubt. Washington wrote to Congress, after reaching Fort Lee: “It seems to be generally believed that the investing of Fort Washington, is one object they have in view. I propose to stay in this neighborhood a few days; in which time I expect the design of the enemy will be more disclosed, and their incursions made in this quarter, or their investure of Fort Washington, if they are intended.” While the assault was in preparation, Washington took boat to cross and examine for himself the condition of the works; but meeting Generals Putnam and Greene, who satisfied him that there would be a stout defence, he returned without landing. Three assaults were made, Generals Knyphausen, Percy, Cornwallis and Matthews commanding divisions. These repeated charges up the very steep ascents from the rear, and from the open face of the work northward, were very costly to the British and Hessian columns. When their forces first gained the interior lines, surrender, or rescue, was inevitable. To the demand for surrender Magaw replied with a request for five hours’ delay. A half hour only was granted. Magaw received a billet from Washington stating that if he could hold out awhile, he would endeavor to bring off the garrison at night; but no delay was permitted, and the garrison surrendered. It was for many years an unexplained fact, how the British troops appeared so suddenly at the open face of the fort, northward, below which was a deep ravine, itself almost a protection. But William Dumont, Magaw’s Adjutant, deserted, two weeks before the investment, and placed detailed drawings of all the defences in the hands of General Howe. This fact affords the key to General Howe’s otherwise very singular excuse to the British Government for not following Washington’s army from White Plains to North Castle Heights,—“political reasons” having been assigned by General Howe, as “controlling his action.”

The British loss in the assault was one hundred and twenty-eight; and that of the Hessian troops, three hundred and twenty-six. The American loss was one hundred and twenty, killed and wounded, and two thousand six hundred and thirty-four, prisoners. The loss in cannon, tents, arms and military stores, was very severe.

Fort Lee was of necessity abandoned, its powder and principal supplies being first removed in safety.

The first New Jersey campaign immediately ensued.