Castle gates also depend for their defense upon the
exploitation of the mural tower as potential weak points likely to be attacked
first. The towers could be sealed
off so that if attackers gained possession of one section, they could not
necessarily continue to the next without capturing the tower.
The gateway into the bailey was generally a substantial building of two
or three stories and was approached from across the moat by means of a causeway
and a drawbridge. In addition to the main gateway there was usually a small
postern, placed in such a position that escape could not be affected or a sally
made unobserved by the enemy.
Plan of Conway Castle