When the Roman Catholic Queen Mary I succeeded to the throne there were changes in the leadership on the Isle of Wight and the castle. Worsley was dismissed in favour of a Roman Catholic appointee in 1553 and Udall was executed in 1555 for his role in the Dudley conspiracy to overthrow the Queen.[16] When the Protestant Elizabeth I came to the throne in 1558, however, peace was made with France and military attention shifted towards the Spanish threat to England.[17] Elizabeth reappointed Worsley to his post and he carried out an extensive redevelopment of the castle.[18] Worsley filled in half of the castle's courtyard to produce a solid artillery platform able to hold eight heavy guns with an uninterrupted field of fire over the sea, and he probably also constructed the Master Gunner's House on the other side of the castle.[19] Nonetheless, an inspection in 1586 showed that the fortification was in poor condition.[5] Work costing £50 was done in 1587, including the erection of an earth bulwark alongside the castle to mount additional guns.[6][lower-alpha 2] The next year saw the attempted invasion of England by the Spanish Armada, after which further repairs were carried out on the castle.[14] By 1599 the Crown was informed that the castle, which was still considered an important defence for the Solent, needed expensive repairs.[20]