Washington seems to have been by no means disheartened at the loss of Philadelphia. On the contrary he justly regarded the circumstance of the enemy holding that city as one which might, as in the sequel it actually did, turn to the advantage of the American cause. Writing to General Trumbull on the 1st of October (1777), he says: "You will hear, before this gets to hand, that the enemy have at length gained possession of Philadelphia. Many unavoidable difficulties and unlucky accidents which we had to encounter helped to promote this success. This is an event which we have reason to wish had not happened, and which will be attended with several ill consequences, but I hope it will not be so detrimental as many apprehend, and that a little time and perseverance will give us some favorable opportunity of recovering our loss, and of putting our affairs in a more flourishing condition. Our army has now had the rest and refreshment it stood in need of, and our soldiers are in very good spirits."
Philadelphia being lost Washington sought to make its occupation inconvenient and insecure by rendering it inaccessible to the British fleet. With this design works had been erected on a low, marshy island in the Delaware, near the junction of the Schuylkill, which, from the nature of its soil, was called Mud Island. On the opposite shore of Jersey, at Red Bank, a fort had also been constructed which was defended with heavy artillery. In the deep channel between, or under cover of these batteries, several ranges of chevaux-de-frise had been sunk. These were so strong and heavy as to be destructive of any ship which might strike against them, and were sunk in such a depth of water as rendered it equally difficult to weigh them or cut them through; no attempt to raise them, or to open the channel in any manner, could be successful until the command of the shores on both sides should be obtained.
Other ranges of chevaux-de-frise had been sunk about three miles lower down the river, and some considerable works were in progress at Billingsport on the Jersey side, which were in such forwardness as to be provided with artillery. These works were further supported by several galleys mounting heavy cannon, together with two floating batteries, a number of armed vessels, and some fire ships.
The present relative situation of the armies gave a decisive importance to these works. Cutting off the communication of Howe with his brother's fleet, they prevented his receiving supplies by water. While the American vessels in the river above Fort Mifflin, the name given to the fort on Mud Island, rendered it difficult to forage in Jersey, Washington hoped to render his supplies on the side of Pennsylvania so precarious as to compel him to evacuate Philadelphia.
The advantages of this situation were considerably diminished by the capture of the Delaware frigate.
The day after Cornwallis entered Philadelphia three batteries were commenced for the purpose of acting against any American ships which might appear before the town. While yet incomplete they were attacked by two frigates, assisted by several galleys and gondolas. The Delaware, being left by the tide while engaged with the battery, grounded and was captured, soon after which the smaller frigate and the other vessels retired under the guns of the fort. This circumstance was the more unfortunate as it gave the British general the command of the ferry, and consequently free access to Jersey, and enabled him to intercept the communication between the forts below and Trenton, from which place the garrisons were to have drawn their military stores.
All the expected reinforcements, except the State regiment and militia from Virginia, being arrived, and the detached parties being called in, the effective strength of the army amounted to 8,000 Continental troops and 3,000 militia. With this force Washington determined to approach the enemy and seize the first favorable moment to attack him. In pursuance of this determination the army took a position on the Skippack road, September 30th (1777), about twenty miles from Philadelphia and sixteen from Germantown—a village stretching on both sides the great road leading northward from Philadelphia, which forms one continued street nearly two miles in length. The British line of encampment crossed this village at right angles near the center, and Cornwallis, with four regiments of grenadiers, occupied Philadelphia. The immediate object of General Howe being the removal of the obstructions in the river, Colonel Stirling, with two regiments, had been detached to take possession of the fort at Billingsport, which he accomplished without opposition. This service being effected, and the works facing the water destroyed, Colonel Stirling was directed to escort a convoy of provisions from Chester to Philadelphia. Some apprehensions being entertained for the safety of this convoy, another regiment was detached from Germantown, with directions to join Colonel Stirling.
This division of the British force appeared to Washington to furnish a fair opportunity to engage Sir William Howe with advantage. Determining to avail himself of it, he formed a plan for surprising the camp at Germantown. This plan consisted, in its general outline, of a night march and double attack, consentaneously made, on both flanks of the enemy's right wing, while a demonstration, or attack, as circumstances should render proper, was to be directed on the western flank of his left wing. With these orders and objects the American army began its march from Skippack creek at 7 o'clock in the evening of the 3d of October (1777), in two columns—the right, under Sullivan and Wayne, taking the Chestnut Hill road, followed by Stirling's division in reserve; the left, composed of the divisions of Greene and Stephen, with M'Dougal's brigade and 1,400 Maryland and Jersey militia taking the Limekiln and old York roads, while Armstrong's Pennsylvania militia advanced by the Ridge road. Washington accompanied the right wing, and at dawn of day, next morning, attacked the royal army. After a smart conflict he drove in the advance guard, which was stationed at the head of the village, and with his army divided into five columns prosecuted the attack, but Lieutenant-Colonel Musgrave, of the Fortieth regiment, which had been driven in, and who had been able to keep five companies of the regiment together, threw himself into a large stone house in the village, belonging to Mr. Chew, which stood in front of the main column of the Americans, and there almost a half of Washington's army was detained for a considerable time. Instead of masking Chew's house with a sufficient force and advancing rapidly with their main body, the Americans attacked the house, which was obstinately defended. The delay was very unfortunate, for the critical moment was lost in fruitless attempts on the house; the royal troops had time to get under arms and be in readiness to resist or attack, as circumstances required. General Grey came to the assistance of Colonel Musgrave; the engagement for some time was general and warm; at length the Americans began to give way and effected a retreat with all their artillery. The morning was very foggy, a circumstance which had prevented the Americans from combining and conducting their operations as they otherwise might have done, but which now favored their retreat by concealing their movements.
In this engagement the British had 600 men killed or wounded; among the slain were Brigadier-General Agnew and Colonel Bird, officers of distinguished reputation. The Americans lost an equal number in killed and wounded, besides 400 who were taken prisoners. General Nash, of North Carolina, was among those who were killed. After the battle Washington returned to his encampment at Skippack creek.
The plan of attack formed by Washington for the battle of Germantown was fully justified by the result. The British camp was completely surprised, and their army was on the point of being entirely routed, when the continued fog led the American soldiers to mistake friends for foes, and caused a panic which threw everything into confusion and enabled the enemy to rally.