When the Irish saw that the enemy had halted, and could not be tempted to advance further, they poured down to the attack through the passages in the hedges. The British might have defended these hedges, as the Irish had done, but the soldiers saw that they would be taken in the flank and rear, and, observing a large body of cavalry ascending the hill, they were seized with a panic.

On the first shock of the Irish infantry, the four regiments broke and fled. They were hotly pursued, and slaughtered in great numbers, the Irish cavalry pouring through the openings in the hedges which had been prepared for them. At length, the fugitives reached the edge of the bog, where they gathered in a confused mass; which the officers, in vain, attempted to form into order. The cavalry charged down upon them, broke and scattered them, and drove them into the morass, followed by the Irish infantry, who were better acquainted with the ground, and more accustomed to traversing bogs. The soldiers were driven into the deepest and most difficult portion of the morass, and a great slaughter took place.

The British artillery were planted on the edge of the morass, but so mingled were the two parties that they were unable to fire. Great numbers of the English were killed. Colonels Earl and Herbert, with many officers and men, were taken prisoners, and the remnant of the British were driven completely across the bog, to the shelter of their own cannon.

While this was passing in the centre, another division of Ginckle's army, consisting of English and French infantry, had crossed the bog by a passage more to the right. They also had met with no opposition in passing, and it was only when they reached the hedges, on the firm ground, that the Irish showed themselves, fired, and retreated. This division, more cautious than that of Earl, could not be tempted to pursue, but contented themselves with maintaining their ground under a heavy fire, awaiting anxiously the arrival of the British horse. They could see, however, no sign of them, but could perceive the Irish cavalry descending in large masses, preparing to charge, while the infantry were forming for an advance.

So far the Irish had been successful at every point. They had repulsed every attack made by the British left; had crushed the brigade, composed of the flower of the British infantry, which had assaulted the centre; and were now preparing to destroy the division which stood, unsupported, on their side of the bog.

At this moment, a tumult was heard on the left wing of the Irish, the direction from which the British division expected relief, and the Irish, aware of the importance of the pass of Aughrim, suspended their attack to await the events there.

Saint Ruth had directed the operations of the battle with as much skill as he had prepared for the assault. He had taken up his position on a point of the hill whence he had a complete view of the whole field of battle, and had moved his troops, with calmness and judgment, to meet each of the attacks made upon them; and when he saw the destruction of the English regiment in the centre, he exclaimed, in the full confidence of victory, "Now I will drive the English to the walls of Dublin!"

There was, indeed, but one hope, on the part of the English, of retrieving the day; namely, the success of the attempt to force the passage at Aughrim. But two horsemen abreast could pass under the castle walls. Saint Ruth was aware of the passage, but thought it impassable for cavalry. It might easily have been made so, by cutting a deep gap across it; but here, as at Athlone, his overconfidence proved his destruction. He had, however, taken the precaution to erect a battery commanding the passage, and had placed some battalions of infantry there.

General Talmash, who commanded the English cavalry, knew that the battle was lost, unless he could succeed at this point; and, at the head of his command, he led the way along the pass, which was not only narrow, but broken and encumbered with the ruins of the castle wall. Saint Ruth beheld the attempt of the cavalry with astonishment, and, with the remark: "They are brave fellows, it is a pity they should be sacrificed," sent orders for the Irish horse to move forward and prepare to charge them; and moved down the hill at the head of his officers to the battery.

There is no doubt as to what the result would have been, had the Irish horse charged. They were greatly superior in number, and the English cavalry who had got across the passage were still in confusion, and were suffering from the fire of the battery, and, indeed, even when in equal numbers, William's cavalry had never withstood the charge of the Irish. It seemed that nothing could avert the defeat of the body on which Ginckle's last hope rested.