Washington was mistaken in his conjecture as to Sir William Howe's design. The capture of Fort Washington was, at present, his main object; and he was encamped on Fordham Heights, not far from King's Bridge, until preliminary steps should be taken. In the night of the 14th, thirty flat-bottomed boats stole quietly up the Hudson, passed the American forts undiscovered, and made their way through Spyt den Duivel Creek into Harlem River. The means were thus provided for crossing that river and landing before unprotected parts of the American works.
Apprised by Colonel Magaw of his peril, General Greene sent over reinforcements, with an exhortation to him to persist in his defence; and despatched an express to Washington, who was at Hackensack, where the troops which had crossed from Peekskill were encamped. It was nightfall when Washington arrived at Fort Lee. Greene and Putnam were over at the besieged fortress. He threw himself into a boat, and had partly crossed the river, when he met those generals returning. They informed him of the garrison's having been reinforced, and assured him that it was in high spirits and capable of making a good defence. It was with difficulty, however, they could prevail on him to return with them to the Jersey shore, for he was excessively excited.
Early the next morning (16th), Magaw made his dispositions for the expected attack. His forces, with the recent addition, amounted to nearly three thousand men. As the fort could not contain above a third of that number, most of them were stationed about the outworks. Colonel Lambert Cadwalader, with eight hundred Pennsylvanians, was posted in the outer lines, about two miles and a half south of the fort, the side menaced by Lord Percy with sixteen hundred men. Colonel Rawlings, of Maryland, with a body of troops, many of them riflemen, was stationed by a three-gun battery, on a rocky, precipitous hill, north of the fort, and between it and Spyt den Duivel Creek. Colonel Baxter, of Bucks County, Pennsylvania, with his regiment of militia, was posted east of the fort, on rough, woody heights bordering the Harlem River, to watch the motions of the enemy, who had thrown up redoubts on high and commanding ground on the opposite side of the river, apparently to cover the crossing and landing of troops.
Sir William Howe had planned four simultaneous attacks; one on the north by Knyphausen, who was encamped on the York side of King's Bridge, within cannon shot of Fort Washington, but separated from it by high and rough hills, covered with almost impenetrable woods. He was to advance in two columns, formed by detachments made from the Hessians of his corps, the brigade of Rahl, and the regiment of Waldeckers. The second attack was to be by two battalions of light infantry and two battalions of guards, under Brigadier-general Mathew, who was to cross Harlem River in flat-boats, under cover of the redoubts above mentioned, and to land on the right of the fort. This attack was to be supported by the first and second grenadiers, and a regiment of light infantry under command of Lord Cornwallis. The third attack, intended as a feint to distract the attention of the Americans, was to be by Colonel Sterling, with the 42d regiment, who was to drop down the Harlem River in bateaux to the left of the American lines, facing New York. The fourth attack was to be on the south, by Lord Percy, with the English and Hessian troops under his command, on the right flank of the American intrenchments.
About noon, a heavy cannonade thundering along the rocky hills, and sharp volleys of musketry, proclaimed that the action was commenced. Knyphausen's division was pushing on from the north in two columns, as had been arranged. The right was led by Colonel Rahl, the left by himself. Rahl essayed to mount a steep, broken height called Cock Hill, which rises from Spyt den Duivel Creek, and was covered with woods. Knyphausen undertook a hill rising from the King's Bridge road, but soon found himself entangled in a woody defile, difficult to penetrate, and where his Hessians were exposed to the fire of the three-gun battery, and Rawlings' riflemen.
While this was going on at the north of the fort, General Mathew, with his light infantry and guards, crossed the Harlem River in the flat-boats, under cover of a heavy fire from the redoubts. He made good his landing, after being severely handled by Baxter and his men, from behind rocks and trees, and the breastworks thrown up on the steep river bank. A short contest ensued. Baxter, while bravely encouraging his men, was killed by a British officer. His troops, overpowered by numbers, retreated to the fort. General Mathew now pushed on with his guards and light infantry to cut off Cadwalader. That officer had gallantly defended the lines against the attack of Lord Percy, until informed that Colonel Sterling was dropping down Harlem River in bateaux to flank the lines and take him in the rear. He sent off a detachment to oppose his landing. They did it manfully. About ninety of Sterling's men were killed or wounded in their boats, but he persevered, landed, and forced his way up a steep height, which was well defended, gained the summit, forced a redoubt, and took nearly two hundred prisoners. Thus doubly assailed, Cadwalader was obliged to retreat to the fort. He was closely pursued by Percy with his English troops and Hessians, but turned repeatedly on his pursuers. Thus he fought his way to the fort, with the loss of several killed and more taken prisoners; but marking his track by the number of Hessians slain.
The defence on the north side of the fort was equally obstinate and unsuccessful. Rawlings with his Maryland riflemen and the aid of the three-gun battery, had for some time kept the left column of Hessians and Waldeckers under Knyphausen at bay. At length Colonel Rahl, with the right column of the division, having forced his way directly up the north side of the steep hill at Spyt den Duivel Creek, came upon Rawlings' men, whose rifles, from frequent discharges, had become foul and almost useless, drove them from their strong post, and followed them until within a hundred yards of the fort, where he was joined by Knyphausen, who had slowly made his way through dense forest and over felled trees. Here they took post behind a large stone house, and sent in a flag with a summons to surrender.
[Washington had been an anxious spectator of the battle from the opposite side of the Hudson. The action about the lines to the south lay open to him. When he saw Cadwalader assailed in flank, the line broken, and his troops overpowered by numbers, he gave up the game as lost. Seeing the flag from Knyphausen's division go into the fort, he wrote a note to Magaw, telling him that if he could hold out until evening and the place could not be maintained, he would endeavor to bring off the garrison. Captain Gooch offered to be the bearer of the note. He crossed in a small boat, landed on the bank, ran up to the fort and delivered the message. It came too late.] "The fort was so crowded by the garrison and the troops which had retreated into it that it was difficult to move about. The enemy, too, were in possession of the little redoubts around, and could have poured in showers of shells and ricochet balls that would have made dreadful slaughter." It was no longer possible for Magaw to get his troops to man the lines: he was compelled, therefore, to yield himself and his garrison prisoners of war. The only terms granted them were that the men should retain their baggage and the officers their swords.
The sight of the American flag hauled down, and the British flag waving in its place, told Washington of the surrender. His instant care was for the safety of the upper country, now that the lower defences of the Hudson were at an end. Before he knew anything about the terms of capitulation, he wrote to General Lee, informing him of the surrender, and calling his attention to the passes of the Highlands and those which lay east of the river; begging him to have such measures adopted for their defence as his judgment should suggest to be necessary. Lee, in reply, objected to removing from his actual encampment at Northcastle. "It would give us," said he, "the air of being frightened; it would expose a fine, fertile country to their ravages; and I must add, that we are as secure as we could be in any position whatever." After stating that he should deposit his stores, etc., in a place fully as safe, and more central than Peekskill, he adds: "As to ourselves, light as we are, several retreats present themselves. In short, if we keep a good look-out, we are in no danger; but I must entreat your Excellency to enjoin the officers posted at Fort Lee, to give us the quickest intelligence, if they observe any embarkation on the North River." As to the affair of Fort Washington, all that Lee observed on the subject was: "Oh, general, why would you be over-persuaded by men of inferior judgment to your own? It was a cursed affair."1
1 [Colonel Reed, in a letter to General Lee, at this juncture had allowed himself, notwithstanding the devotion he had hitherto manifested for the commander-in-chief, to express himself with great critical freedom on the loss of Fort Lee. After alluding to the fact that Washington's own judgment was averse to the attempt of holding the fort, but that Greene's advice to the contrary had kept his mind in a state of suspense, he exclaims, "Oh, general! an indecisive mind is one of the greatest misfortunes that can befall an army; how often have I lamented it this campaign." Some days later a letter from General Lee came to head-quarters addressed to Colonel Reed, who at the time was absent. Washington supposing it to be on official business, opened it, as he was in the habit of doing on like occasions. To his surprise he discovered it to be a private note, the tenor of which indicated that he was the subject of critical correspondence between a member of his military family and one of his generals. He immediately enclosed the letter to Colonel Reed, explaining how it had been opened, but without further comment. Reed endeavored to explain away the remarks in Lee's letter; but Washington's affectionate confidence in him as a sympathizing friend had received a severe wound. Reed deeply grieved over the error he had committed, and his earnest appeals to Washington at a later date, restored, in a great measure, their relations of friendly confidence.]