The bastions are structures which extend into the ditch, allowing guns to fire at an enemy who is trying to scale the walls of the fort. Again, the gun embrasures you see were originally several feet higher above the ditch than at present, making them much more difficult for an enemy to attack.

The bastions are structures which extend into the ditch, allowing guns to fire at an enemy who is trying to scale the walls of the fort. Again, the gun embrasures you see were originally several feet higher above the ditch than at present, making them much more difficult for an enemy to attack.