Arriving in front of the enemy about mid-day on the 12th of July, the English and Dutch regiments of horse guards, and a squadron of CUNNINGHAM'S dragoons, were sent forward to force the enemy from a pass in the middle of a bog which lay in front of the Irish army, in which service they succeeded; and two hundred men of the regiment drove the enemy from a ford on the right of the opposing army in gallant style, and from the pass of Urachree. St. Ruth sent forward fresh troops, and the INNISKILLING dragoons being also supported, a considerable body of troops was soon engaged at this point, and the enemy was eventually driven back. The English generals met, and after some deliberation, resolved on a general engagement, and between four and five in the afternoon the battle began. After several hours' sharp fighting, in which the INNISKILLING men gave fresh proofs of their innate bravery and contempt of danger, the adverse army sustained a decisive overthrow, and was chased from the field of battle until the darkness of the night and a thick misty rain put an end to the pursuit. During the action, the French general, St. Ruth, was killed by a cannon ball, as he rode down Kilcommoden hill, and his fall so dismayed King James's army that it was soon thrown into confusion and routed. CUNNINGHAM'S INNISKILLING dragoons had one lieutenant, one cornet, and forty-one non-commissioned officers and private soldiers killed; one captain, one lieutenant, and twenty-seven men wounded on this occasion. After the victory at Aghrim, the army advanced to _Galway_, and the INNISKILLING dragoons were employed before this fortress during the siege, which was terminated on the 21st of July, by the surrender of the place. The English forces subsequently moved towards Limerick, where the wreck of King James's army was assembled; but SIR ALBERT CUNNINGHAM was left with his regiment of dragoons in the county of Galway. _Sligo_ was subsequently invested by a circular chain of posts at a distance from the town, and one troop of the INNISKILLING dragoons was stationed at the abbey of Ashro, near Ballyshannon, and the remainder at Loughrea, Hedford, and Shrewl. The governor of Sligo, Sir Teague O'Regan, proposed conditions for surrendering the town; but afterwards receded, when a closer blockade of the place was resolved upon. At the same time SIR ALBERT CUNNINGHAM was directed to proceed with his regiment to Castlebar, to join the Irish forces under Sir Baldearg O'Donnel, who had agreed to abandon the interests of King James, and to join the English army with his brigade.