The Coloured Squadrons of the Royal Navy [1] were first introduced in the Tudor Period during the reign of Queen Elizabeth I of England (1558–1603).
Assigned to each of these squadrons were flag officers who were separated in terms of their seniority by the use of coloured flags: in effect the squadrons provided a system of designating the nine or ten most senior admirals of the Royal Navy until the system was abolished in 1864.
[2] Squadrons and divisions continued to be used as system of managing large formations when the British navy consisted of more than one fleet for most of the twentieth century until 1971.
[3] Historically, the English fleet was first divided into three squadrons distinguished by colour in 1558, the Admiral of the English fleet, the Lord Admiral of England's squadron, flew a plain red flag as its ensign.
Naval forces were under the command of the Lord Admiral of England, Charles Howard, 1st Earl of Nottingham whose squadron was in the centre, whilst land forces were under the command of the General of the Army, Robert Devereux, 2nd Earl of Essex whose squadron was also in the centre.
The van squadron, or front, was commanded by the Vice Admiral of the Fleet (Vice-Admiral of England).
Once he had reached Rear-Admiral of the Red, on his next promotion he became a Vice-Admiral of the Blue and so on, until he finally became an Admiral of the White.