Mackay, Hugh (məkĪˈ) [key], 1640?–1692, Scottish soldier. After service with several continental armies, he joined the Dutch forces in 1673, took his regiment to England (1685) to help suppress the uprising in favor of the duke of Monmouth, and in 1688 accompanied William of Orange (William III) to England. Commanding English troops in Scotland, he was defeated by the Jacobites under Viscount Dundee at Killiecrankie (1689) but later put down the Jacobite rising. He was killed fighting the French in the battle of Steenkerke.
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