Irish Confederate expedition to Scotland

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The Irish Confederate expedition to Scotland took place in 1644–1645 during the Wars of the Three Kingdoms. A force of about 2,000 Irish Confederate troops, under the command of Alasdair Mac Colla, sailed to Scotland in June 1644, where they joined with Royalist forces fighting Montrose's Highland campaign against the Covenanters. The expedition was the result of an effort by King Charles I to enlist help from Irish Catholics in fighting Parliamentarian forces.