The tidings of this signal repulse of the enemy came most opportunely to Washington, when he was apprehending an attack upon New York.
General Putnam, beside his bravery in the field, was somewhat of a mechanical projector. The batteries at Fort Washington had proved ineffectual in opposing the passage of hostile ships up the Hudson. He was now engaged on a plan for obstructing the channel opposite the fort, so as to prevent the passing of any more ships. A letter from him to General Gales (July 26th) explains his project. "We are preparing chevaux-de-frise, at which we make great despatch by the help of ships, which are to be sunk. The two ships' sterns lie towards each other, about seventy feet apart. Three large logs, which reach from ship to ship, are fastened to them. The two ships and logs stop the river two hundred and eighty feet. The ships are to be sunk, and when hauled down on one side, the pricks will be raised to a proper height, and they must inevitably stop the river, if the enemy will let us sink them."
It so happened that one Ephraim Anderson, adjutant to the second Jersey battalion, had recently submitted a project to Congress for destroying the enemy's fleet in the harbor of New York. He had attempted an enterprise of the kind against the British ships in the harbor of Quebec during the siege, and, according to his own account, would have succeeded, had not the enemy discovered his intentions, and stretched a cable across the mouth of the harbor, and had he not accidentally been much burnt. His scheme was favorably entertained by Congress, and Washington, by a letter dated July 10th, was instructed to aid him in carrying it into effect. Anderson, accordingly, was soon at work at New York constructing fire-ships, with which the fleet was to be attacked. Simultaneous with the attack, a descent was to be made on the British camp on Staten Island, from the nearest point of the Jersey shore, by troops from Mercer's flying camp, and by others stationed at Bergen under Major Knowlton, Putnam's favorite officer for daring enterprises. Projectors are subject to disappointments. It was impossible to construct a sufficient number of fire-ships and galleys in time. The flying camp, too, recruited but slowly, and scarcely exceeded three thousand men; the combined attack by fire and sword had therefore to be given up.
In the course of a few days arrived a hundred sail, with large reinforcements, among which were one thousand Hessians, and as many more were reported to be on the way. The troops were disembarked on Staten Island, and fortifications thrown up on some of the most commanding hills. All projects of attack upon the enemy were now out of the question. Indeed, some of Washington's ablest advisers questioned the policy of remaining in New York, where they might be entrapped as the British had been in Boston.
During the latter part of July, and the early part of August, ships of war with their tenders continued to arrive, and Scotch Highlanders, Hessians, and other troops to be landed on Staten Island. At the beginning of August, the squadron with Sir Henry Clinton, recently repulsed at Charleston, anchored in the bay.
In the meantime, Putnam's contrivances for obstructing the channel had reached their destined place. A letter, dated Fort Washington, August 3d, says: "Four ships, chained and boomed, with a number of amazing large chevaux-de-frise, were sunk close by the fort under command of General Mifflin, which fort mounts thirty-two pieces of heavy cannon. We are thoroughly sanguine that they (the ships up the river) never will be able to join the British fleet, nor assistance from the fleet be afforded to them." Another letter, written at the same date from Tarrytown, on the borders of the Tappan Sea, gives an account of an attack made by six row galleys upon the Phoenix and the Rose. They fought bravely for two hours, hulling the ships repeatedly, but sustaining great damage in return; until their commodore, Colonel Tupper, gave the signal to draw off.
The force of the enemy collected in the neighborhood of New York was about thirty thousand men; that of the Americans a little more than seventeen thousand, but was subsequently increased to twenty thousand, for the most part, raw and undisciplined. One-fourth were on the sick list with bilious and putrid fevers and dysentery; others were absent on furlough or command; the rest had to be distributed over posts and stations fifteen miles apart.
Washington kept the most watchful eye upon the movements of the enemy. Beside their great superiority in point of numbers as well as discipline, to his own crude and scanty legions, they possessed a vast advantage in their fleet. "They would not be half the enemy they are," observed Colonel Reed, "if they were once separated from their ships." Every arrival and departure of these, therefore, was a subject of speculation and conjecture. Aaron Burr, at that time in New York, aide-de-camp to General Putnam, speaks in a letter to an uncle, of thirty transports, which, under convoy of three frigates, had put to sea on the 7th of August, with the intention of sailing round Long Island and coming through the Sound, and thus investing the city by the North and East Rivers. "They are then to land on both sides of the island," writes he, "join their forces, and draw a line across, which will hem us in, and totally cut off all communication; after which, they will have their own fun."
In this emergency, Washington wrote to General Mercer for 2,000 men from the flying camp. Colonel Smallwood's battalion was immediately furnished, as a part of them. The Convention of the State ordered out hasty levies of country militia, to form temporary camps on the shore of the Sound, and on that of the Hudson above King's Bridge, to annoy the enemy, should they attempt to land from their ships on either of these waters. Others were sent to reinforce the posts on Long Island. Many of the yeomen of the country, thus hastily summoned from the plough, were destitute of arms, in lieu of which they were ordered to bring with them a shovel, spade, or pickaxe, or a scythe straightened and fastened to a pole. This rustic array may have provoked the thoughtless sneers of city scoffers, such as those cited by Graydon; but it was in truth one of the glorious features of the Revolution, to be thus aided in its emergencies by "hasty levies of husbandmen."
By the authority of the New York Convention, Washington had appointed General George Clinton to the command of the levies on both sides of the Hudson. He now ordered him to hasten down with them to the fort just erected on the north side of King's Bridge; leaving two hundred men under the command of a brave and alert officer to throw up works at the pass of Anthony's Nose, where the main road to Albany crosses that mountain. Troops of horse also were to be posted by him along the river to watch the motions of the enemy.