Stewart was born after 1670, the 3rd surviving son of Alexander Stewart, 3rd Earl of Galloway and his wife Lady Mary Douglas, daughter of James Douglas, 2nd Earl of Queensberry He was educated at Glasgow University in 1687 and then joined the army.
He was an ensign in the 3rd Foot Guards in 1691, a captain-lieutenant in April 1692, and captain and lieutenant-colonel in July 1692.
The same year he was promoted Brigadier-General and later served in the Peninsula commanding British forces during the War of the Spanish Succession.
[1] He was initially defeated at the 1710 general election, but petitioned and was reinstated as MP for Wigtownshire on 3 March 1711.
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