Civil war broke out in 1642 between the followers of King Charles I and those of Parliament. Initially, Captain Barnaby Burley, a relative of John, and an ardent Royalist, held the castle on behalf of the King with a tiny garrison.[1] Burley negotiated surrender terms, including that he initially be allowed to remain in the castle with armed protection, and the castle remained in the control of Parliament for the rest of the war.[23] Early during the Interregnum it was decided to increase the size of the garrison at the castle from 30 to 70 soldiers, due to concerns about a potential Royalist attack from the island of Jersey.[23] Most of the soldiers lived outside the castle itself.[2] The annual cost of this force was around £78 and in 1655 the garrison was made smaller again to reduce costs.[3][lower-alpha 2]