"Let the men dismount, Captain Davenant, and let them and the horses feed. We have a long ride before us tonight. I have just heard that William's siege artillery is coming up, under a weak escort, and I mean to get round in the Dutchman's rear and destroy it. He shall find that Limerick is not to be taken as easily as he expects.
"He has had a disagreeable sample of our quality today. A deserter brought in news of the exact position of his tent, and our artillery have been giving him such a peppering that, from the church tower, we see that he has been obliged to move his camp."
As soon as it was night, four hundred cavalry were in the saddle. Sarsfield placed himself at their head, and rode twelve miles up the Shannon to Killaloe. Crossing the river there, he made a wide sweep with his cavalry, until he was in the heart of the Tipperary mountains, in rear of William's camp.
Quietly as the expedition had been carried out, it was impossible that so large a body of horse should ride through the country unperceived, and a gentleman of county Clare, named O'Brian, thinking that he would gain honour and advantage by reporting their passage to William, set out for the British camp. Being unknown there, he was a long time before he could get access to the king. The officers to whom he spoke paid little attention to his story about a body of Irish horse passing through the country, and were much more interested in gaining information from him as to the state of the stock of cattle, sheep, and pigs in his part of the county; for, owing to the terror excited by the conduct of William's soldiers, the people for many miles round had driven off their stock and left the villages, and provisions were already becoming scarce in the camp.
At length, however, one of those to whom he had spoken mentioned his story to the king, who at once sent for him, and saw the importance of the news he brought. O'Brian himself had no idea of the object of Sarsfield's expedition, but the king instantly guessed that it was the siege train. He therefore ordered a large body of cavalry to be immediately despatched to meet the artillery on its way, and protect it into camp.
All day, Sarsfield remained in concealment among the mountains, until, towards evening, the train came in sight, moving slowly with its escort of two troops of dragoons along the high road. He watched it until it halted, and encamped for the night, in a field beside the highway. He waited until the horses were picketed, and the men engaged in making their encampment for the night. Then the Irish cavalry burst down from the glen in which they had been hiding. The officer in command sounded to horse, but it was too late; before the men were in the saddle, the Irish were upon them, and in a moment the two troops of dragoons were dispersed or killed.
Sarsfield's men at once set to, to collect the powder waggons, pontoons, and baggage of every description. The great guns were filled with powder to the muzzle, and then buried two-thirds of their length in the earth. The whole mass of siege equipage was piled above them, and a train of gunpowder was laid to the store in the centre. The men then drew off to a distance. A match was applied to the train, and the whole blew up with a tremendous explosion.
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.