The defence of the bastion system was based on strong artillery and the carefully planned ground plan of the fortresses, which enabled different parts of the fortress to participate in each other's defensive battle. From the bastions of the fortress, it was possible to fire in front of the neighboring bastions, and thus there was not a single dead corner in front of the fortress where the frendly fire would not have reached.
Although the fortresses were significantly lower than medieval castles, their walls were made high enough with the help of moats that it was not possible to take the fortresses by direct assault.
