The non-arrival of reinforcements from the Northern army continued to embarrass Washington's operations. The enemy were making preparations for further attempts upon Forts Mercer and Mifflin. General Howe was constructing redoubts and batteries on Province Island, on the west side of the Delaware, within five hundred yards of Fort Mifflin, and mounting them with heavy cannon. Washington consulted with his general officers what was to be done. Had the army received the expected reinforcements from the North, it might have detached sufficient force to the west side of the Schuylkill to dislodge the enemy from Province Island; but at present it would require almost the whole of the army for the purpose. This would leave the public stores at Easton, Bethlehem and Allentown, uncovered, as well as several of the hospitals. It would also leave the post at Red Bank unsupported, through which Fort Mifflin was reinforced and supplied. It was determined, therefore, to await the arrival of the expected reinforcements from the North, before making any alteration in the disposition of the army. In the meantime, the garrisons of Forts Mercer and Mifflin were increased, and General Varnum was stationed at Red Bank with his brigade, to be at hand to render reinforcements to either of them as occasion might require.
On the 10th of November, General Howe commenced a heavy fire upon Fort Mifflin from his batteries, which mounted eighteen, twenty-four, and thirty-two pounders. Major Fleury acquitted himself with intelligence and spirit as engineer; but an incessant cannonade and bombardment for several days, defied all repairs. The block-houses were demolished, the palisades beaten down, the guns dismounted, the barracks reduced to ruins. Captain Treat, a young officer of great merit, who commanded the artillery, was killed, as were several non-commissioned officers and privates; and a number were wounded. The survivors, who were not wounded, were exhausted by want of sleep, hard duty, and constant exposure to the rain. Colonel Smith himself was disabled by severe contusions, and obliged to retire to Red Bank.
The fort was in ruins; there was danger of its being carried by storm, but the gallant Fleury thought it might yet be defended with the aid of fresh troops. Such were furnished from Varnum's brigade: Lieutenant-colonel Russell, of the Connecticut line, replaced Colonel Smith. He in his turn was obliged to relinquish the command through fatigue and ill health, and was succeeded by Major Thayer of Rhode Island, aided by Captain (afterwards commodore) Talbot. On the fourth day the enemy brought a large Indiaman, cut down to a floating battery, to bear upon the works; but though it opened a terrible fire, it was silenced before night. The next day several ships-of-war got within gunshot. Two prepared to attack it in front; others brought their guns to bear on Fort Mercer; while two made their way into the narrow channel between Mud Island and the Pennsylvania shore, to operate with the British batteries erected there.
At a concerted signal a cannonade was opened from all quarters. The heroic little garrison stood the fire without flinching; the danger, however, was growing imminent. The batteries on Province Island enfiladed the works. The ships in the inner channel approached so near as to throw hand-grenades into the fort, while marines stationed in the round-tops stood ready to pick off any of the garrison that came in sight. The scene now became awful; incessant firing from ships, forts, gondolas and floating batteries, with clouds of sulphurous smoke, and the deafening thunder of cannon. Before night there was hardly a fortification to defend; palisades were shivered, guns dismounted, the whole parapet levelled. There was terrible slaughter; most of the company of artillery were destroyed; Fleury himself was wounded. Captain Talbot received a wound in the wrist, but continued bravely fighting until disabled by another wound in the hip.
To hold out longer was impossible. Colonel Thayer made preparations to evacuate the fort in the night. Everything was removed in the evening that could be conveyed away without too much exposure to the murderous fire from the round-tops. The wounded were taken over to Red Bank, accompanied by part of the garrison. Thayer remained with forty men until eleven o'clock, when they set fire to what was combustible of the fort they had so nobly defended, and crossed to Red Bank by the light of its flames.
The loss of this fort was deeply regretted by Washington, though he gave high praise to the officers and men of the garrison. Colonel Smith was voted a sword by Congress, and Fleury received the commission of lieutenant-colonel. Washington still hoped to keep possession of Red Bank, and thereby prevent the enemy from weighing the chevaux-de-frise before the frost obliged their ships to quit the river. "I am anxiously waiting the arrival of the troops from the northward," writes he, "who ought, from the time they have had my orders to have been here before this. Colonel Hamilton, one of my aides, is up the North River, doing all he can to push them forward, but he writes me word that he finds many unaccountable delays thrown in his way. The want of these troops has embarrassed all my measures exceedingly."
The delays in question will best be explained by a few particulars concerning the mission of Colonel Hamilton. [Hamilton had expected to find matters in such a train that he would have little to do but hurry on ample reinforcements already on the march; but he soon discovered that it was designed to retain the greater part of the Northern army at Albany and in the Highlands, sparing only about four thousand men to the commander-in-chief. Morgan and his riflemen had been tardily detached, he having met them on the march near New Windsor on the morning of November 2d. Putnam, he found, was busy with the project of an attack on New York; and Gates was full of reasons why more troops should not be despatched southward, claiming that there was no certainty that Sir Henry Clinton had gone to join Howe, and that there was a possibility of his returning up the river. If his army were depleted, Albany would be exposed, New England left open to the ravages of the enemy, and his own contemplated movement against Ticonderoga abandoned. It was with the greatest difficulty that Hamilton induced Gates to detach the brigades of Poor and Patterson to the aid of the commander-in-chief. Washington would not have received a man, he declared, if the whole could have been kept at Albany with any decency. Governor Clinton, Hamilton found, was the only general officer who appreciated Washington's position, and disposed to promote the general good, independent of personal considerations. Putnam who, unlike Gates, was innocent of intrigues against the commander-in-chief, was still so bent upon his favorite scheme of an attack on New York, that only Hamilton's positive orders, as from Washington, to send the Continental troops under him southward, retaining the militia, brought the bellicose veteran to a reluctant compliance. Washington, in a letter to Putnam, reprimanded his tardiness, concluding with, "I could wish that in future my orders may be immediately complied with, without arguing upon the propriety of them." The intrigues in progress around him made it necessary for Washington at this moment to assert his superior command, although he acquitted Putnam of any part in them.]
In the meantime, Sir William Howe was following up the reduction of Fort Mifflin by an expedition against Fort Mercer, which still impeded the navigation of the Delaware. On the 17th of November, Lord Cornwallis was detached with two thousand men to cross from Chester into the Jerseys, where he would be joined by a force advancing from New York. Apprised of this movement, Washington detached General Huntington with a brigade, to join Varnum at Red Bank. General Greene was also ordered to repair thither with his division, and an express was sent off to General Glover who was on his way through the Jerseys with his brigade, directing him to file off to the left towards the same point. These troops, with such militia as could be collected, Washington hoped would be sufficient to save the fort. Before they could form a junction, however, and reach their destination, Cornwallis appeared before it. A defence against such superior force was hopeless. The works were abandoned; they were taken possession of by the enemy who proceeded to destroy them. After the destruction had been accomplished, the reinforcements from the North, so long and so anxiously expected, and so shamefully delayed, made their appearance. "Had they arrived but ten days sooner," writes Washington to his brother, "it would, I think, have put it in my power to save Fort Mifflin, which defended the chevaux-de-frise, and consequently have rendered Philadelphia a very ineligible situation for the enemy this winter."
The evil which Washington had so anxiously striven to prevent had now been effected. The American vessels stationed in the river had lost all protection. Some of the galleys escaped past the batteries of Philadelphia in a fog, and took refuge in the upper part of the Delaware; the rest were set on fire by their crews and abandoned. Washington advised the navy board, now that the enemy had the command of the river, to have all the American frigates scuttled and sunk immediately. The board objected to sinking them, but said they should be ballasted and plugged, ready to be sunk in case of attack. Washington warned them that an attack would be sudden, so as to get possession of them before they could be sunk or destroyed;—his advice and warning were unheeded; the consequence will hereafter be shown.