Ginckle advanced slowly, for he had to march through a waste and desolate country. Sarsfield, with his cavalry, hovered round him, and intercepted his communications, and he was so short of draught horses that it was only by forcing the gentry of Dublin to give up their carriage horses, for the use of the army, that he was enabled to move forward.

It was not until the end of August that he sat down with his siege train in front of Limerick, and prepared for the siege. For the moment, the party in favour of peace among the Irish had been silenced by the news that twenty large ships of war, with a great number of transport and store ships, were being pushed forward at Brest and other French ports to come to their assistance.

Ginckle occupied the same ground which William's army had taken up in the first siege, but directed his attacks chiefly upon the English town. As before, the Irish communication was open with the county of Clare, and the seventeen regiments of Irish horse were encamped on the Clare side of the river. Ginckle pushed on his works with great vigour, and the duty in the trenches was so severe, that the cavalry were compelled to take their turn with the infantry; but, notwithstanding that the siege artillery was much more powerful than that which William had at his disposal, but little progress was made. The town was set on fire several times; but the flames were speedily extinguished, and, as the inhabitants had all left the city and erected tents on the Clare side, under the protection of their cavalry, little harm was done to them.

While the siege was going on, a number of desultory engagements took place, in different parts of the country, between the Protestant militia which had been lately raised, and the bands of rapparees, with varying success.

The season was getting late. Ginckle was again becoming straitened for provisions, for the proclamations which he issued failed to inspire the peasantry with any confidence. He now erected a battery, of thirty-five guns, against King's Island; and, after an incessant cannonade of some days, a breach was effected in the wall between the abbey and Ballsbridge. Preparations were made for crossing the arm of the Shannon and assaulting the breach; but the works constructed for crossing the river were repeatedly destroyed by the Irish, and the idea of assault upon the breach was, at length, abandoned. So desperate did Ginckle now think his position, that he issued orders for the repair of the fortifications of Kilmallock, intending to raise the siege and establish his winter quarters there; but he postponed taking this step for a few days, for to do so would be to bring almost certain disaster upon his army.

The French fleet was expected to arrive shortly, and the Irish, reinforced with men, arms, and supplies of every kind, would probably resume the offensive during the winter, and he would find himself cut off from all supplies and assistance. He determined, therefore, to make one more effort before retiring.

He had, throughout the siege, been in communication with several Irish officers of high rank, and especially with General Clifford, who commanded the cavalry posted on the river opposite to his camp. These officers were as desirous as he was of bringing the war to an end, for they foresaw that if, after the arrival of the French, they succeeded in driving the English out of the country, Ireland would simply become a dependency of France, and they preferred the English connection to this. Ginckle determined to try, again, the same feint which had succeeded at Athlone. The workmen were kept busy repairing the works at Kilmallock, and preparing that place for the reception of the army. The greater portion of the baggage, and a regiment of Danes, were sent forward to that town. The batteries ceased firing, and the cannon were dismounted at several points, and the Irish were persuaded that the siege was about to be abandoned.

Meanwhile, Ginckle was busy collecting boats, and preparing a bridge across to a small island, which lay not far from the Clare side of the river. On a dark night, the boats were brought up and the bridge constructed, and, led by six hundred grenadiers, a strong force of infantry, cavalry, and artillery crossed to the island, and then waded through the shallow water beyond to the mainland.

A few men, posted on the island, carried the news to Clifford, but he gave no orders to the four regiments of cavalry and two of infantry under his command, nor did he send any notice to the camp. Some of the infantry and cavalry, however, ran without orders to the bank, and kept the grenadiers in check until the British cavalry had crossed, and compelled them to fall back. The British cavalry then dashed forward to the Irish cavalry camp, which they took completely by surprise. Panic stricken at this unexpected attack, the soldiers and the citizens in the town camp fled in all directions, and, great numbers rushing to Thomond Bridge, entered the city by that narrow approach.

Had Ginckle at once pushed forward, he would have captured almost the whole of the Irish officials and civilians on the Clare side of the river; but, fearing an ambuscade, he halted his troops before advancing to the Irish camp, and this gave time for most of them to escape. Being afraid that the garrison would sally out from the town, and attack his lines on the other side of the river, he recrossed the Shannon with his troops, carrying with them a crowd of civilians, among them a number of persons of rank, and officials with the records and public treasure.