The shock was heard in the faraway camp of William, and he knew that his cavalry had arrived too late to avert the catastrophe he feared. They had, indeed, just arrived within sight of the spot when the explosion took place. They rode on at full speed, only to find the vast pile of ruined woodwork blazing furiously. The Irish cavalry was seen in the distance, leisurely retiring; but, although the English pursued for a short time, the Irish easily evaded them in the darkness among the hills. The whole of William's cavalry in camp were sent out, when the explosion was felt, to endeavour to cut off the Irish horse; but Sarsfield was well acquainted with the ground, and retired with his troops safely across the Shannon, having struck a terrible blow against the designs of William. The king, however, found that, in spite of the measures Sarsfield had taken, two of the guns remained uninjured by the explosion. These were brought to the camp, and another heavy gun was fetched from Waterford, together with a small quantity of ammunition. The regiments were at once set to manufacture fascines for the siege, and this work proceeded quickly, the orchards and plantations furnishing an abundance of wood. The fascines were used for filling up ditches, and the advances against the town were pushed forward with vigour. But the besiegers were not allowed to carry on their work unmolested, for a constant fire was kept up by the guns on the walls, and the besieged made several sorties, driving back the working parties, destroying their work, and retiring before any considerable bodies of troops could be brought up to attack them. The three heavy guns were, however, brought into position at a short distance from the wall, and began to play upon it. The dissensions between the Irish commanders still continued, and, beyond Sarsfield's raid against the battering train, nothing was done to annoy the enemy in the rear, although, had any vigour been shown, the Irish army lying idle west of the Shannon could have moved across, and speedily starved out William's army by cutting off all supplies. Even as it was, provisions could only be collected by sending out strong bodies of troops to plunder the country; for the peasantry had been goaded into fury by the evil conduct of the troops, and were now in a state of insurrection, cutting off and murdering all stragglers, and driving in small parties.