In 1641 Montrose was imprisoned in Edinburgh Castle after attempting to expose the Covenanting leaders to Charles I. He had been one of the leading Covenanting military commanders during the Bishops Wars but grew disillusioned with Argyll's political dominance of the movement. His arrest and imprisonment was a political act and he was released after several months. His subsequent switch to the royalist cause led to the 1644-45 campaign.
The size of the opposing forces is not recorded in the surviving sources.
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