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This article details the history of the Scots Guards from 1642 to 1804. The Scots Guards (SG) is a regiment of the Guards Division of the British Army. The Scots Guards trace their origins back to 1642 when, by order of King Charles I, the regiment was raised by Archibald Campbell, 1st Marquess of Argyll for service in Ireland, and was known as the Marquis of Argyll's Royal Regiment. It spent a number of years there and performed a variety of duties, but in the mid-1640s, during the Wars of the Three Kingdoms, the regiment took part in the fight against James Graham, 1st Marquess of Montrose who was fighting on the side of Charles I. In 1646, Montrose left Scotland upon the defeat of the King in England.