A council of war was called, which determined unanimously, that, should General Howe continue his march towards New York, all the troops raised on the west side of the Hudson should cross that river, to be afterwards followed by those raised in the eastern part of the continent, leaving three thousand men for the defence of the Highlands about the North river.
In a letter to congress communicating this movement of the British army, and this determination of the council, the general said, "I can not indulge the idea that General Howe, supposing him to be going to New York, means to close the campaign, and to sit down without attempting something more.

I think it highly probable, and almost certain, that he will make a descent with part of his troops into the Jerseys; and, as soon as I am satisfied that the present manoeuvre is real, and not a feint, I shall use all the means in my power to forward a part of our force to counteract his designs.
"I expect the enemy will bend their force against fort Washington, and invest it immediately.

From some advices, it is an object that will attract their earliest attention." He also addressed a letter to the governor of New Jersey, expressing a decided opinion that General Howe would not content himself with investing fort Washington, but would invade the Jerseys; and urging him to put the militia in the best possible condition to reinforce the army, and to take the place of the new levies, who could not, he suggested, be depended on to continue in service one day longer than the first of December, the time for which they were engaged.
Immediate intelligence of this movement was likewise given to General Greene, who commanded in the Jerseys; and his attention was particularly pointed to fort Washington.
As the British army approached Kingsbridge, three ships of war passed up the North River, notwithstanding the fire from forts Washington and Lee, and notwithstanding the additional obstructions which had been placed in the channel.
{November 8.} On being informed of this, another letter was addressed to General Greene, stating that this fact was so plain a proof of the inefficacy of all the obstructions thrown in the river, as to justify a change in the dispositions which had been made.

"If," continued the letter, "we can not prevent vessels from passing up, and the enemy are possessed of the surrounding country, what valuable purpose can it answer to attempt to hold a post from which the expected benefit can not be derived?
I am therefore inclined to think it will not be prudent to hazard the men and stores at Mount Washington; but as you are on the spot, I leave it to you to give such orders respecting the evacuation of the place, as you may think most adviseable; and so far revoke the orders given to Colonel Magaw to defend it to the last." Measures were now taken to cross the North River with the troops which had been raised on its western side, and General Washington determined to accompany that division of the army.

The eastern regiments remained on the eastern side of the river, under the command of General Lee, with orders to join the Commander-in-chief, should the British army cross the Hudson.
[Sidenote: And General Washington with a part of his army crosses the North River.] After visiting the posts about Peekskill, and making all the arrangements in his power for their defence, General Washington passed the North River in the rear of the troops designed to act in the Jerseys, and proceeded to the quarters of General Greene, near fort Lee.
From too great a confidence[47] in the strength of fort Washington, and a conviction of its importance, General Greene had not withdrawn its garrison under the discretionary orders he had received, but still indulged a hope that the post might be maintained, or, should its situation become desperate, that means might be found to transport the troops across the river to the Jersey shore, which was defended by fort Lee.
[Footnote 47: Extract of a letter from General Greene, dated September 11th, 1778.
"Remember the effect that the loss of the garrison of fort Washington had; there were men enough to have defended themselves against all the army had they not been struck with a panic; but, being most of them irregular troops, they lost their confidence when the danger began to grow pressing, and so fell a prey to their own fears."-- _Life of Greene_, v.