The Prince and Princess of Orange having ascended the throne while the regiment was quartered in Lincolnshire, it took part in the solemnity of the proclamation of their Majesty's accession at Stamford, on the 16th of February, 1689, on which occasion three troops, with the trumpets and kettle drums, paraded the town, and, 'after firing several volleys, partook of a substantial repast, with abundance of wine, and drank their Majesties' health amidst reiterated acclamations.' In the middle of March three troops proceeded to the Isle of Wight, where 1500 Irish Roman Catholics were detained in the custody of a military force. These men had entered the service of King James in Ireland, and had been ordered to England to support the arbitrary proceedings of the Court; at the Revolution they were deprived of their arms and sent prisoners to the Isle of Wight, from whence they were eventually transported to Hamburgh, to be disposed of in the service of the Emperor of Germany. Thirty men and horses of the regiment were transferred, in April, to the Blues, to complete the establishment of that corps previous to its embarkation for Holland. During the summer three troops of the SIXTH HORSE were encamped on Hounslow Heath. King William had reasons to suspect that several old corps were not well affected towards his interests; but His Majesty appears to have placed entire confidence in the attachment of the officers and men of this regiment to his person and government; and in August a strong detachment left the camp at Hounslow, to take part in the duties of the Court and metropolis. The remainder of the three troops of the SIXTH HORSE, encamped on the heath, proceeded into quarters at Croydon and Mitcham; and in December, the three troops in the Isle of Wight were removed to Salisbury. [Sidenote: 1690] The detachment having been relieved from the King's duty in London, the regiment was removed in February, 1690, into quarters at Oxford and Abingdon. In the following month it received orders to embark for Ireland, to serve under King William, against the French and the Irish Roman Catholics under King James. This order was, however, countermanded, and when the King proceeded with three troops of Life Guards to Ireland, this regiment marched into quarters in the villages near London, in order to take part in the duties of the Court. Having been relieved from this duty by the Fourth Horse (now 3rd Dragoon Guards), the regiment marched into quarters at Portsmouth and Isle of Wight, and subsequently to Salisbury and Winchester. During the winter, the Fifth Regiment of Horse[9] was disbanded in Ireland; and the SIXTH HORSE obtained rank as FIFTH HORSE from this period. [Sidenote: 1691]