To meet this new movement, Washington threw his advance of 5,000 men, under Putnam, into New Jersey, where they encamped near Hackensack; he sent Heath up to Peekskill, with 3,000 men, to guard the entrance to the Highlands; and he left Lee at North Castle, with 7,000 men, and ordered him to coöperate with him promptly in whatever direction, as soon as the nature of Howe's plans should become apparent. As Forts Washington and Lee detained a large force in garrison, while they had shown themselves unable to prevent ships from passing up the river, there was no longer any use in holding them. Nay, they had now become dangerous, as traps in which the garrisons and stores might be suddenly surrounded and captured. Washington accordingly resolved to evacuate them both, while, to allay the fears of Congress in the event of a descent from Canada, he ordered Heath to fortify the much more important position at West Point. [Sidenote: Congress meddles with the situation and muddles it] Had Washington's orders been obeyed and his plans carried out, history might still have recorded a retreat through "the Jerseys," but how different a retreat from that which was now about to take place! The officious interference of Congress, a venial error of judgment on the part of Greene, and gross insubordination on the part of Lee, occurring all together at this critical moment, brought about the greatest disaster of the war, and came within an ace of overwhelming the American cause in total and irretrievable ruin. Washington instructed Greene, who now commanded both fortresses, to withdraw the garrison and stores from Fort Washington, and to make arrangements for evacuating Fort Lee also. At the same time he did not give a positive order, but left the matter somewhat within Greene's discretion, in case military circumstances of an unforeseen kind should arise. Then, while Washington had gone up to reconnoitre the site for the new fortress at West Point, there came a special order from Congress that Fort Washington should not be abandoned save under direst extremity. If Greene had thoroughly grasped Washington's view of the case, he would have disregarded this conditional order, for there could hardly be a worse extremity than that which the sudden capture of the fortress would entail. But Greene's mind was not quite clear; he believed that the fort could be held, and he did not like to take the responsibility of disregarding a message from Congress. In this dilemma he did the worst thing possible: he reinforced the doomed garrison, and awaited Washington's return. [Illustration: REMAINS OF FORT WASHINGTON, NEW YORK, 1856] [Sidenote: Howe takes Fort Washington by storm, Nov. 16]