 Montrose affirmed that Murray had sent to the Scots at Newcastle in October 1640 copies of private letters which he had written to the king, then at York.He accompanied Charles to Scotland in 1641, and having got access to Montrose (who was then a prisoner in Edinburgh Castle, by order of the covenanters) he carried communications from one to the other.After encouraging the impeachment of Hamilton and Argyll, it is said that Murray informed them of their danger, and hence their flight.