Lord Forbes retiring from the service at this period, the Prince of Orange conferred the colonelcy of the regiment on Major Sir John Edgeworth, by commission dated the 31st of December, 1688: at the same time measures were adopted to recruit its diminished numbers. [Sidenote: 1689] In the beginning of April, 1689, the regiment marched to Chester, where it was stationed several weeks. Colonel Sir John Edgeworth having been guilty of irregularity in procuring clothing, viz., purchasing the old clothing of disbanded Roman Catholic soldiers, from the Jews, to supply the recruits, instead of providing new clothing, was deprived of his commission; and on the 1st of May, 1689, the colonelcy was conferred on EDWARD EARL OF MEATH: Major Newcomb was appointed lieut.-colonel, and Captain Frederick Hamilton major. Early in May the regiment marched into Wales. Meanwhile the Prince of Orange had been elevated to the throne; but Earl Tyrconnel, who had been nominated lord-lieutenant of Ireland in the preceding year, had retained that country in the Roman Catholic interest; King James had arrived there with a body of French troops, and the whole country was subject to him, excepting Enniskillen and Londonderry, which were defended by Protestants. To rescue the suffering Protestants of Ireland from the power of their enemies, King William assembled an army at Chester, under Marshal Frederick Duke Schomberg; and the EARL OF MEATH'S regiment being selected for this service, marched to Highlake, where it embarked for Ireland, and landing at White-house, near Belfast, on the 22nd of August, joined the troops under Duke Schomberg, who had commenced the siege of _Carrickfergus_, which fortress surrendered a few days afterwards. The regiment advanced with the army to Dundalk, where a camp was formed on low, wet ground, which occasioned great loss of life among the troops from disease. No action of importance occurred during this campaign, and the regiment passed the winter in quarters at Lisburn, where it furnished a daily guard at Duke Schomberg's quarters: its ranks were completed by zealous Protestants, who were eager to enrol themselves under its colours, and it was the strongest corps in the army. [Sidenote: 1690] In the summer of 1690, King William arrived in Ireland, and the officers and soldiers of the regiment had the honor of serving under the eye of their Sovereign. They took part in the memorable battle of the _Boyne_, on the 1st of July, when the army of King William forced the passage of the river in the face of the French and Irish forces under King James, and gained a decisive victory.