At this moment, Greene, who had also been delayed, attacked the right wing with such vigour as presently to force it back toward the Market House. The British ranks were falling into confusion, and Smallwood's column had already arrived upon their right flank, when the accident occurred which changed the fortunes of the day. From the beginning the dense fog had been a source of confusion to both armies, and had seriously interfered with the solidity of the American advance. Now, as Stephen's brigade, on the right of Greene's column, came into the village, the heavy firing at Judge Chew's seems to have caused him to diverge more and more to the west, in the belief that there was the thick of the battle. At the same time, Wayne, in driving the enemy before him, had swayed somewhat to the east, so that his brigade stood almost directly in the line of Stephen's progress. In this position he was attacked by Stephen, who mistook him for the enemy. This lamentable blunder instantly ruined the battle. Wayne's men, thus fiercely attacked in the rear, and struggling to extricate themselves, were thrown upon the left flank of Sullivan's brigade, and a panic suddenly ran through the army. The confusion grew worse and worse, till a general retreat began, and Grey, who had come up to support the crumbling right wing of the British, was now able to lead in the pursuit of the Americans. He was joined by Cornwallis, who had sprung from his bed in Philadelphia at the first sound of the cannon, and had brought up two battalions with him at double-quick. But the panic had subsided almost as soon as the golden moment of victory was lost, and the retreat was conducted in excellent order. One regiment in Greene's column was surrounded and captured, but the army brought away all its cannon and wounded, with several cannon taken from the enemy. The loss of the Americans in killed and wounded was 673, and the loss of the British was 535. [Illustration: HOUSE AT GERMANTOWN OCCUPIED BY THE BRITISH]