The Flat Bastion (Spanish: Baluarte de Santiago), the South Bastion (Spanish: Baluarte de Nuestra Señora del Rosario), and Southport Ditch were elements in the defence of the gate and the city.
Flat Bastion (bahasa Spanyol: Baluarte de Santiago), South Bastion (bahasa Spanyol: Baluarte de Nuestra Señora del Rosario), dan Southport Ditch merupakan elemen pertahanan gerbang dan kota.