On the removal of Lieut.-General Conway to the fourth Irish horse, now seventh dragoon guards, in July, 1754, Colonel John Mostyn was appointed to the colonelcy of the THIRTEENTH Dragoons, from the Seventh Royal Fusiliers. [Sidenote: 1757] [Sidenote: 1758] [Sidenote: 1759] [Sidenote: 1761] Colonel Mostyn was promoted to the rank of major-general, in 1757, and was removed in 1758, to the Fifth Royal Irish Dragoons,--when His Majesty conferred the colonelcy of the THIRTEENTH on Archibald Douglas, from the lieut.-colonelcy of the fourth dragoons. This officer was one of the King's aides-de-camp and a member of parliament, and he was promoted to the rank of major-general in 1759, and to that of lieut.-general in 1761. [Sidenote: 1768] [Sidenote: 1770] In the clothing warrant of 1768, the facings of the regiment are directed to be of _deep green_, and the waistcoats and breeches of buff, instead of light-green. White waistcoats and breeches were adopted a few years afterwards, and a small red and white feather was introduced into the cocked-hats. [Sidenote: 1778] Lieut.-General Douglas died at Dublin, in October, 1778, and was succeeded by Lieut.-General Richard Pierson, from the thirty-sixth foot. This officer was rewarded with the dignity of a Knight of the Bath. [Sidenote: 1779] In 1779, the regiment proceeded by forced marches to the north of Ireland, in consequence of disturbances in that quarter, and its presence soon restored order. [Sidenote: 1780] The THIRTEENTH Dragoons encamped in 1780, with the army in the neighbourhood of Ardfinnan,--and, on the breaking up of the encampment, moved into quarters at Clonmel, Carrick-on-Suir, and Cappoquin. [Sidenote: 1781] Lieut.-General Pierson expired suddenly on the morning of the 13th of February, 1781, and was succeeded by Lieut.-General Francis Craig, from the lieut.-colonelcy of the First regiment of Foot-Guards. In 1781 the regiment marched to Charleville and Bruff, and was subsequently stationed at Cork, where it received orders to proceed, with some other regiments and artillery under the command of Colonel Ralph Abercromby, against George Robert Fitzgerald, who had fortified his family residence near Castlebar, in the county of Mayo, and was in open rebellion against the laws. On the arrival of the forces at Castlebar, they proceeded on the service assigned to them,--but Fitzgerald had fled and quitted the country: some ship guns, which he had mounted, were seized and brought into the barracks at Castlebar,--where the THIRTEENTH remained,--sending detachments to Ballinrobe and Sligo. [Sidenote: 1782] [Sidenote: 1783]