Brigadier-General Bowles was removed in March, 1719, to the Eighth Dragoons, and was succeeded in the colonelcy of the Twelfth, by Lieut.-Colonel Phineas Bowles. This officer was promoted to the rank of brigadier-general in 1735; to that of major-general in 1739, and was removed, in 1740, to the Seventh Horse, now Sixth Dragoon Guards, when King George II. conferred the colonelcy of the Twelfth Dragoons on Colonel Alexander Rose, from the Twentieth Foot.
1743
1746
Colonel Rose commanded the regiment until the summer of 1743, when he was succeeded by Colonel Samuel Walter Whitshed, from the Thirty-ninth Foot; and in April, 1746, Brigadier-General Thomas Bligh was appointed to the colonelcy of the regiment, from the Twentieth Foot.
1747
1749
Brigadier-General Bligh was promoted to the rank of major-general in 1747, and removed to the Second Irish Horse, now Fifth Dragoon Guards; and the colonelcy of the Twelfth Dragoons was conferred on Major-General Sir John Mordaunt, from the Eighteenth regiment of Foot. This distinguished officer was promoted to the Tenth Dragoons, in 1749, and was succeeded by Major-General Lord George Sackville, afterwards Viscount Sackville, from the Twentieth regiment of Foot.
1750
On the 18th of January, 1750, Lord George Sackville was promoted to the Third Irish Horse, now Sixth Dragoon Guards; and the colonelcy of the Twelfth Dragoons was conferred on Lieut.-Colonel Sir John Whitefoord, Baronet, from the Thirty-fifth Foot.
1751
King George II. issued, on the 1st of July, 1751, a warrant regulating the clothing, standards and colours of the several regiments, from which the following particulars have been extracted respecting the Twelfth Dragoons:—