He joined the British army as a cornet in the King's Own Royal Regiment of Scottish Horse some time before 1688.

He commanded a brigade of dragoons at the battles of Blenheim, Ramillies, Oudenarde and Malplaquet.

He was removed from the colonelcy of the Royal Dragoons of Ireland by George I on 8 October 1715, but reappointed on 1 February 1729, holding the post until his death.

He died at Bath on 5 August 1732 and was buried at Fearn Abbey, leaving his estate of Balnagown, which he had inherited from David Ross, the 13th Laird of Balnagown, in 1711, to his great-nephew Charles Ross.

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