That night the Americans abandoned Fort Mifflin.
Their loss, Beatson says, amounted to near 400 killed and wounded; that of the British to 43.

If this be correct, it should have established the invincibility of men who under such prodigious disparity of suffering could maintain their position so tenaciously.
After the loss of Mud Island, Red Bank could not be held to advantage, and it was evacuated on the 21st, when an attack was imminent.

The American vessels retreated up the river; but they were cornered, and of course ultimately were destroyed.

The obstructions being now removed, the British water communications by the line of the Delaware were established,--eight weeks after the occupation of the city, which was to be evacuated necessarily six months later.
While these things were passing, Howe's triumph was marred by the news of Burgoyne's surrender on the 17th of October.

For this he could not but feel that the home government must consider him largely responsible; for in the Chesapeake, too late to retrieve his false step, he had received a letter from the minister of war saying that, whatever else he undertook, support to Burgoyne was the great object to be kept in view.
During the operations round Philadelphia, Sir Henry Clinton in New York had done enough to show what strong probabilities of success would have attended an advance up the Hudson, by the twenty thousand men whom Howe could have taken with him.