In 1637, Launceston Castle was used to imprison the Puritan writer John Bastwick; contemporary accounts noted that the decaying castle was "so ruinous that every small blast of wind threatened to shatter it down upon his head". Shortly afterwards, the English Civil War broke out between the followers of Charles I and Parliament. The castle was predominantly held by the Royalists, until it was finally taken by the Parliamentarian general, Sir Thomas Fairfax, in February 1646.; Before retreating from the town, the Royalist forces reportedly stripped the castle of the lead from its roofs and gave the timbers to the townsfolk to use as fuel. It was left in such a poor condition that Parliament did not bother to slight it, unlike many other captured castles.
