Washington had projected two works also just below the Highlands, at Stony Point and Verplanck's Point, to serve as outworks of the mountain passes, and to protect King's Ferry, the most direct and convenient communication between the Northern and Middle States. A small but strong fort had been erected on Verplanck's Point, and was garrisoned by seventy men under Captain Armstrong. A more important work was in progress at Stony Point. When completed, these two forts, on opposite promontories, would form as it were the lower gates of the Highlands. To be at hand in case of any real attempt upon the Highlands, Washington drew up with his forces in that direction; moving by the way of Morristown.
An expedition up the Hudson was really the object of Sir Henry Clinton's movements, and for this he was strengthened by the return of Sir George Collier with his marauding ships and forces from Virginia. On the 30th of May, Sir Henry set out on his second grand cruise up the Hudson, with an armament of about seventy sail, great and small, and one hundred and fifty flat-boats. Admiral Sir George Collier commanded the armament, and there was a land force of about five thousand men under General Vaughan.
The first aim of Sir Henry was to get possession of Stony and Verplanck's Points; his former expedition had acquainted him with the importance of this pass of the river. On the morning of the 31st, the forces were landed in two divisions, the largest under General Vaughan, on the east side of the river, about seven or eight miles below Verplanck's Point; the other, commanded by Sir Henry in person, landed in Haverstraw Bay, about three miles below Stony Point. There were but about thirty men in the unfinished fort; they abandoned it on the approach of the enemy, and retreated into the Highlands, having first set fire to the block-house. The British took quiet possession of the fort in the evening; dragged up cannon and mortars in the night, and at daybreak opened a furious fire upon Fort Lafayette. It was cannonaded at the same time by the armed vessels, and a demonstration was made on it by the division under General Vaughan. Thus surrounded, the little garrison of seventy men was forced to surrender, with no other stipulation than safety to their persons and to the property they had in the fort. Major André was aide-de-camp to Sir Henry, and signed the articles of capitulation.
Washington presumed that the main object of Sir Henry was to get possession of West Point, the guardian fortress of the river, and that the capture of Stony and Verplanck's Points were preparatory steps. He would fain have dislodged him from these posts, but deferring any attempt on them for the present, he took measures for the protection of West Point. Leaving General Putnam and the main body of the army at Smith's Clove, a mountain pass in the rear of Haverstraw, he removed his head-quarters to New Windsor, to be near West Point in case of need, and to press the completion of its works. General McDougall was transferred to the command of the Point. Three brigades were stationed at different places on the opposite side of the river, under General Heath, from which fatigue parties crossed daily to work on the fortifications.
This strong disposition of the American forces checked Sir Henry's designs against the Highlands. Contenting himself, therefore, for the present, with the acquisition of Stony and Verplanck's Points, he returned to New York, where he soon set on foot a desolating expedition along the seaboard of Connecticut. That State, while it furnished the American armies with provisions and recruits, and infested the sea with privateers, had hitherto experienced nothing of the horrors of war within its borders. Sir Henry, in compliance with his instructions from government, was now about to give it a scourging lesson. General (late Governor) Tryon, was the officer selected by Sir Henry for this inglorious, but apparently congenial service. About the beginning of July he embarked with two thousand six hundred men, in a fleet of transports and tenders, and was convoyed up the Sound by Sir George Collier with two ships-of-war.
On the 5th of July the troops landed near New Haven, in two divisions, one led by Tryon, the other by Brigadier-general Garth, his lieutenant. They came upon the neighborhood by surprise; yet the militia assembled in haste, and made a resolute though ineffectual opposition. The British captured the town, dismantled the fort, and took or destroyed all the vessels in the harbor; with all the artillery, ammunition, and public stores. Several private houses were plundered. They next proceeded to Fairfield; where, meeting with greater resistance, they thought the moment arrived for a wholesome example of severity. Accordingly, they not merely ravaged and destroyed the public stores and the vessels in the harbor, but laid the town itself in ashes. The exact return of this salutary lesson gives the destruction of ninety-seven dwelling-houses, sixty-seven barns and stables, forty-eight store-houses, three places of worship, a court-house, a jail, and two school-houses.
At Norwalk, where they landed on the 11th of July, they burnt one hundred and thirty dwelling-houses, eighty-seven barns, twenty-two store-houses, seventeen shops, four mills, two places of worship, and five vessels which were in the harbor. The loss of the British throughout the whole expedition amounted, according to their own accounts, to twenty killed, ninety-six wounded, and thirty-two missing. It was intended to crown this grand ravage by a descent on New London, a noted rendezvous of privateers; but as greater opposition was expected there than at either of the other places the squadron returned to Huntington Bay, on Long Island, to await reinforcements; and Commodore Collier proceeded to Throg's Neck, to confer with Sir Henry Clinton about further operations.
Washington on hearing of the departure of the expedition to the eastward, and before he was acquainted with its definite object, detached General Heath, with two brigades of Connecticut militia, to counteract the movements of the enemy. This was all that he could spare from the force stationed for the protection of the Highlands. Any weakening of his posts there might bring the enemy suddenly upon him, such was their facility in moving from one place to another by means of their shipping. Indeed, he had divined that a scheme of the kind was at the bottom of the hostile movement to the eastward.
As a kind of counter-check to Sir Henry, Washington had for some days been planning the recapture of Stony Point and Fort Lafayette. He had reconnoitred them in person; spies had been thrown into them, and information collected from deserters. Stony Point having been recently strengthened by the British was now the most important. It was a rocky promontory advancing far into the Hudson, which washed three sides of it. A deep morass, covered at high water, separated it from the mainland, but at low tide might be traversed by a narrow causeway and bridge. The promontory was crowned by strong works, furnished with heavy ordnance, commanding the morass and causeway. Lower down were two rows of abatis, and the shore at the foot of the hill could be swept by vessels of war anchored in the river. The garrison was about six hundred strong, commanded by Lieutenant-colonel Johnson.
To attempt the surprisal of this isolated post, thus strongly fortified, was a perilous enterprise. General Wayne, Mad Anthony as he was called from his daring valor, was the officer to whom Washington proposed it, and he engaged in it with avidity. According to Washington's plan, it was to be attempted by light-infantry only, at night, and with the utmost secrecy, securing every person they met to prevent discovery. Between one and two hundred chosen men and officers were to make the surprise; preceded by a vanguard of prudent, determined men, well commanded, to remove obstructions, secure sentries, and drive in the guards. On getting possession of Stony Point, Wayne was to turn its guns upon Fort Lafayette and the shipping. A detachment was to march down from West Point by Peekskill, to the vicinity of Fort Lafayette, and hold itself ready to join in the attack upon it, as soon as the cannonade began from Stony Point.