When the opposing armies took the field, the French had obtained possession of Ghent and Bruges by treachery; but the English General surprised the French on the march near _Oudenarde_ on the 11th of June, and gained a decisive victory. The EIGHTEENTH regiment formed part of the leading brigade of the van of the army, under Major-General Cadogan, and with the eighth, twenty-third, and thirty-seventh regiments, descended from the high grounds between Eyne and Bevere, forded a rivulet, and attacked seven battalions of the Swiss regiments of Pfeffer, Villars, and Gueder, which had taken post at Eyne: after a sharp contest British valour prevailed, and Brigadier-General Pfeffer, with three entire battalions, were made prisoners of war: the remainder were either killed, or intercepted in their attempt to escape, and made prisoners. The EIGHTEENTH afterwards attacked a body of troops posted in the enclosures, and soon drove the French from their ground. As the regiment was advancing in pursuit, a numerous body of French cavalry menaced it in front and flank, and it fell back to the hedges, where it repulsed the French horsemen. Other British brigades arriving, the whole advanced; a fierce conflict of musketry ensued, and charge succeeded charge until darkness put an end to the conflict, and thus saved the French army from complete annihilation. The enemy made a precipitate retreat during the night. Lieut.-Colonel Stearne commanded the regiment on this occasion, and he states in his journal,--"Our regiment, though the first that engaged, had only one lieutenant and eight men killed, and twelve men wounded." The ROYAL IRISH regiment formed part of the force employed in the siege of the important fortress of _Lisle_, the capital of French Flanders, and the regiment had numerous opportunities of distinguishing itself during the long and determined defence made by a numerous garrison under Marshal Boufflers. The citadel did not surrender until the 9th of December. The EIGHTEENTH had two captains and three subalterns killed, the major and several other officers wounded, and two hundred non-commissioned officers and soldiers killed and wounded. [Sidenote: 1709]