In 1675 the command of this regiment was conferred on Colonel John Fenwick, who had distinguished himself at the battle of Seneffe; at this period the regiment discontinued the designation of "Irish," and many English gentlemen received commissions in it. After leaving its quarters at Bois-le-Duc in the spring of 1675, the regiment was encamped for a short time on one of the beautiful plains of Louvain, and it was subsequently employed in manœuvring near the frontiers of France and in the Principality of Liege. The progress of the campaign was impeded by the severe indisposition of the Prince of Orange; no engagement of importance occurred, and in the autumn the regiment marched to the Dutch Netherlands and passed the winter in garrison at Utrecht. [Sidenote: 1676] In the summer of 1676 the regiment marched to Brabant, and was stationed at Bois-le-Duc, preparatory to some expedition of importance. This occurred in the early part of July, and the men were in high spirits, anticipating some splendid adventure. About two o'clock in the morning the drums beat "to arms;" the regiment immediately assembled at the alarm-post, and commenced its march for the province of Limburg, being joined by other corps every day. On the fifth day, the Prince of Orange appeared at the head of the troops, and, to the surprise of the enemy, the famous city of _Maestricht_ was besieged. This city, which was well fortified with all the works which art could suggest, was defended by 8000 chosen men commanded by Monsieur Calvo, a resolute Catalonian. The Prince of Orange attended to the progress of the siege; and after the arrival of the battering train, the works were carried on with vigour. The three English regiments[2] were formed in one Brigade, and they soon distinguished themselves, beating back the sallies of the garrison with great slaughter. On the 30th of July, a storming party of two hundred men, furnished in equal proportions by the three regiments, attacked the Dauphin Bastion, and after a severe contest effected a lodgment, but afterwards lost their ground: this proved a sanguinary affair, and 150 men were killed and wounded out of the two hundred. On the 2nd of August the Brigade was again on duty in the trenches, when Colonel Fenwick was wounded.