Immediately after the establishment was finally arranged, the FOURTH HORSE were ordered to march into quarters in the metropolis, where they arrived in February, 1686, to assist the Life Guards in the duties of the court; at the same time a detachment of one officer and six men proceeded to Liverpool to convey the specie collected by the officers of the revenue at that port from thence to London; which was probably a very necessary service, as the King, by doubling the strength of his regular army, had made a great increase in his expenditure. During the summer of this year the regiment was encamped on Hounslow Heath, where it was several times reviewed by the King, and afterwards went into quarters at Cambridge, Huntingdon, and St. Ives. At this period the following Officers were holding commissions in the regiment:-- CAPTAINS. LIEUTENANTS. CORNETS. Troop. 1st. Earl of Plymouth (Col.) Humphry Perott. Thos. Wendover. 2nd. Hugh Sunderland (Lt. Col.) Doyley Mitchell. Wm. Wentworth. 3rd. Earl of Abercorn. Henry Holford. Vincent Martin. 4th. Henry Lord Eyland. Edm. Pendergrast. Wm. Fenwick. 5th. Ambrose Brown. Thomas Platt. Daniel Vivian. 6th. Sir Thos. Bludworth. Peter Barnsley. M. D. Morton. Lionel Walden Major. Thomas Hodds Chaplain. Thomas Platt Adjutant. Thomas Jones Chirurgeon. [Sidenote: 1687] In the summer of 1687 the regiment was again quartered for a short time in London, and it was subsequently encamped on Hounslow Heath, where a series of reviews and mock-battles were performed by the troops in presence of the court. The King spent much of his time on the Heath witnessing the exercise of the several corps, and endeavouring to ingratiate himself in the affections of his army, in order to render it subservient in the execution of his designs against the established religion and laws of the country. [Illustration: Fourth Horse, 1687. Constituted Third Dragoon Guards in 1746. [To face page 6.] On the 3rd of November, in this year, the Earl of Plymouth died, and the Colonelcy of the FOURTH HORSE was given to Brigadier-General Sir John Fenwick, who had for several years held the appointment of Lieut.-Colonel of the Second Troop, now Second Regiment, of Life Guards; he was also one of the inspecting generals of cavalry, and was known to be firmly attached to the King, and a zealous supporter of the measures of the court. Several officers resigned their commissions, and they were replaced by men whose principles were presumed to be favourable to papacy and absolute monarchy. [Sidenote: 1688]