The castle would have been entered through the entrance bastion. The core of this building was constructed in the second phase of work on the castle and was initially a square one-storey construct, across, before being extended forward by an additional to form a circular bastion; an additional floor was then added on top in the third phase. The internal walls have mostly been destroyed, but the ground floor chambers would have been used for administration, and possibly as living rooms for the deputy captain. The first floor would have formed a high-status set of chambers for the use of the captain, and included large windows, fireplaces and a private garderobe, but most of this storey has been destroyed. A special German cocklestove was probably fitted into the chambers for the use of Philip Chute, the first captain of the castle, and was illustrated with pictures of Landsknecht soldiers and Protestant German leaders; only fragments of the stove have survived.