The Americans formed a line of the same extent; the regulars under Colonel Butler on the right flank resting on the river, the militia under Colonel Denison on the left wing on the marsh. A sharp fire was opened from right to left; after a few volleys the enemy in front of Colonel Butler began to give way. The Indians, however, throwing themselves into the marsh, turned the left flank of the Americans and attacked the militia in the rear. Denison, finding himself exposed to a cross fire, sought to change his position, and gave the word to fall back. It was mistaken for an order to retreat. In an instant the left wing turned and fled; all attempts to rally it were vain; the panic extended to the right wing. The savages, throwing down their rifles, rushed on with tomahawk and scalping-knife, and a horrible massacre ensued. Some of the Americans escaped to Forty Fort, some swam the river; others broke their way across the swamp, and climbed the mountain; some few were taken prisoners; but the greater number were slaughtered.
The desolation of the valley was now completed; fields were laid waste, houses burnt, and their inhabitants murdered. According to the British accounts, upwards of four hundred of the yeomanry of Wyoming were slain, and five thousand persons fled in the utmost distress and consternation, seeking refuge in the settlements on the Lehigh and the Delaware. After completing this horrible work of devastation, the enemy retired before the arrival of the troops detached by Washington.
For a great part of the summer, Washington had remained encamped at White Plains, watching the movements of the enemy at New York. Early in September he observed a great stir of preparation; cannon and military stores were embarked, and a fleet of one hundred and forty transports were ready to make sail. What was their destination? There were but two capital objects which they could have in view, beside the defeat and dispersion of his army. One was to get possession of the forts and passes of the Highlands: the other, by a junction of their land and naval forces, to attempt the destruction of the French fleet at Boston, and regain possession of that town. Those points were so far asunder that it was difficult to protect the one without leaving the other exposed. To do the best that the nature of the case would admit, Washington strengthened the works and reinforced the garrison in the Highlands, stationing Putnam with two brigades in the neighborhood of West Point. General Gates was sent with three brigades to Danbury in Connecticut, where he was joined by two brigades under General McDougal, while Washington moved his camp to a rear position at Fredericksburg on the borders of Connecticut, and about thirty miles from West Point, so as to be ready for a movement to the eastward or a speedy junction for the defence of the Hudson.
Scarce had Washington moved from White Plains, when Sir Henry Clinton threw a detachment of five thousand men under Lord Cornwallis into the Jerseys, between the Hackensack and Hudson Rivers, and another of three thousand under Knyphausen into Westchester County, between the Hudson and the Bronx. These detachments held communication with each other, and by the aid of flat-bottomed boats could unite their forces, in twenty-four hours, on either side of the Hudson. Washington considered these mere foraging expeditions, though on a large scale, and detached troops into the Jerseys to co-operate with the militia in checking them; but, as something more might be intended, he ordered General Putnam to cross the river to West Point, for its immediate security; while he himself moved with a division of his army to Fishkill.
Wayne, who was with the detachment in the Jerseys, took post with a body of militia and a regiment of light-horse in front of the division of Lord Cornwallis. The militia were quartered at the village of New Tappan; but Lieutenant-colonel Baylor, who commanded the light-horse, chose to camp apart, to be free, as is supposed, from the control of Wayne. He took up his quarters, therefore, in Old Tappan, where his men lay very negligently and unguardedly in barns. Cornwallis had intelligence of their exposed situation, and laid a plan to cut off the whole detachment. A body of troops from Knyphausen's division was to cross the Hudson in the night, and come by surprise upon the militia in New Tappan: at the same time, Major-general Grey, of marauding renown, was to advance on the left, and attack Baylor and his dragoons in their careless quarters in Old Tappan.
Fortunately Knyphausen's troops, led by Lieutenant-colonel Campbell, were slow in crossing the river, and the militia were apprised by deserters of their danger in time to escape. Not so with Baylor's party. General Grey, having cut off a sergeant's patrol, advanced in silence, and surrounded with his troops three barns in which the dragoons were sleeping. We have seen, in his surprise of Wayne's detachment in the preceding year, how stealthy and effective he was in the work of destruction. To prevent noise he had caused his men to draw the charges and take the flints from their guns, and fix their bayonets. The bayonet was his favorite weapon. With this his men rushed forward, and, deaf for a time to all cries for mercy, made a savage slaughter of naked and defenceless men. Eleven were killed on the spot, and twenty-five mangled with repeated thrusts, some receiving ten, twelve, and even sixteen wounds. Among the wounded were Colonel Baylor and Major Clough, the last of whom soon died.
This whole movement of troops, on both sides of the Hudson, was designed to cover an expedition against Little Egg Harbor, on the east coast of New Jersey, a noted rendezvous of American privateers. Three hundred regular troops, and a body of royalist volunteers from the Jerseys, headed by Captain Patrick Ferguson, embarked at New York on board galleys and transports, and made for Little Egg Harbor under convoy of vessels of war. They were long at sea. The country heard of their coming; four privateers put to sea and escaped; others took refuge up the river. The wind prevented the transports from entering. The troops embarked in row galleys and small craft, and pushed twenty miles up the river to the village of Chestnut Neck. Here were batteries without guns, prize ships which had been hastily scuttled, and storehouses for the reception of prize goods. The batteries and storehouses were demolished, the prize ships burnt, saltworks destroyed, private dwellings sacked and laid in ashes; all, it was pretended, being the property of persons concerned in privateering.
The vessels which brought this detachment being wind-bound for several days, Captain Ferguson had time for another enterprise. Among the forces detached by Washington into the Jerseys to check these ravages, was the Count Pulaski's legionary corps, composed of three companies of foot, and a troop of horse, officered principally by foreigners. A deserter from the corps brought word to the British commander that the legion was cantoned about twelve miles up the river; the infantry in three houses by themselves; Count Pulaski with the cavalry at some distance apart. Informed of these circumstances, Captain Ferguson embarked in boats with two hundred and fifty men, ascended the river in the night, landed at four in the morning, and surrounded the houses in which the infantry were sleeping. "It being a night attack," says the captain in his official report, "little quarter of course could be given, so there were only five prisoners." Fifty of the infantry were butchered on the spot: among whom were two of the foreign officers, the Baron de Bose and Lieutenant de la Broderie. The clattering of hoofs gave note of the approach of Pulaski and his horse, whereupon the British made a rapid retreat to their boats and pulled down the river, and thus ended the marauding expedition of Captain Ferguson, worthy of the times of the buccaneers.
The detachment on the east side of the Hudson likewise made a predatory and disgraceful foray from their lines at King's Bridge, towards the American encampment at White Plains, plundering the inhabitants without discrimination, not only of their provisions and forage, but of the very clothes on their backs. None were more efficient in this ravage than a party of about one hundred of Captain Donop's Hessian yagers, and they were in full maraud between Tarrytown and Dobbs' Ferry, when a detachment of infantry under Colonel Richard Butler, and of cavalry under Major Henry Lee, came upon them by surprise, killed ten of them on the spot, and captured a lieutenant and eighteen privates.
The British detachments having accomplished the main objects of their movements, returned to New York; leaving those parts of the country they had harassed still more determined in their hostility, having achieved nothing but what is least honorable and most detestable in warfare.