This military fortification (nº114) is a small, pentagonal earthwork, capped with stone. It was part of the 1st Line. It was equipped with 1 x 6 calibre, 2 x 9 calibre artillery pieces and 3 embrasures. It could garrison 100 men. Its objective was to defend the flank from attacks on the São Fernando Battery (nº4) and cross fire with the New Subserra Battery.