Over the course of time, the fortification systems were improved: the outer walls of the defenses were faced with stone blocks, the moat was broadened and forward defences were added in front of the rampart.
The fortification systems were improved. This was over the course of time. The outer walls of the defenses were faced with stone blocks. This was over the course of time. The moat was broadened. This was over the course of time. Defences were added in front of the rampart. This was over the course of time.