The war continued in other parts of the country, and towards the end of it a conspiracy was formed by the Royalists to recover possession of the castle, which through the treachery of a Colonel Maurice was successful. Many of the garrison at that time lived outside the walls of the castle, and Maurice persuaded the Governor, Cotterel, to order them to move their homes inside, to which he assented, issuing an order in the country for beds to be provided on a certain day. Taking advantage of this, Maurice and another conspirator dressed themselves as country gentlemen, with swords by their sides, and with nine others, disguised as constables, made their appearance at the castle entrance early in the morning, so as to appear like a convoy guarding the safe passage of the goods. The Governor, who kept the keys, was still in bed, and the soldier on guard at the inside of the gates, who was in league with Maurice, went to inform him the beds had arrived. He handed over the keys, and, not suspecting treachery, remained in bed with his sword at his side as usual. The remainder of the conspirators then drew their swords, and the garrison, on condition that their lives should be spared, surrendered, and were put into one of the prison dungeons. The conspirators then went to the room of the Governor, who, hearing a noise, jumped out of bed and defended himself, but was soon wounded, disarmed, and placed in the dungeon along with the rest, while the Royalists took possession of the castle. This happened in June 1648.
The dungeons in the castle, which were still to be seen, were of the most awful description, for, sunk deep down into the solid rock, it was scarcely necessary to write over them—
Abandon Hope, all ye who enter here.