The bulwark or bastion is a wide arrow-shaped  enclosed in a stone or a brick wall that forms the first of the three sets of walls with its unique nine-pointed star structure. The bank is up to seven meters high. On this wall you can see, even today, a stone curb that marks the level of the ground before the excavation of the ditch. On the corners of the bastion, called “ears”, there were two lodges for soldiers. The one on the left side was equipped with a sortie ramp that led directly out of the fortress while the one on the right was used by the troops as a place of guard and shelter and was equipped, inside, with a fireplace and several niches for lighting.