Besides, there were a number of small posterns. The wall was breached only by four gates and a few small posterns. In addition, posterns (side gates) were provided, for example at Gray's Close. Six casemates defend the main entry, with posterns on other faces. However, some posterns were intended to be defended. The lower floor could also be accessed from the "peribolos" by small posterns. In 1480, a total of nine gates and posterns were enumerated. Access to both terraces was possible through posterns on the sides of the walls' towers. Posterns gave access to the foot of the walls. A single main gate survives towards the east, as well as several posterns.