The keep could also be accessed via a bridge which connected it with the terreplein. On the landward side, a ditch, ramparts, terreplein, caponier and flanking batteries defended the approaches. Around the seaward side of the manning parade runs the terreplein. On the landward side, a dry-moat, ramparts, "terreplein", "caponier" and flanking batteries defended the approaches. The "San Lazaro" battery's terreplein included aljibes, while channels and breakwaters dealt with rainwater.