 VII six-inch BL guns and four 12-pdr quick-firing (QF) BL guns, with ranges of and respectively, mounted on concrete emplacements on the fort's roof.The larger guns were intended to support those at East Tilbury Battery while the smaller ones provided a defence against fast-moving vessels such as destroyers and torpedo boats.Despite their obsolescence, two of the old 12.5-inch RMLs remained at the fort until as late as 1912.