The fort was originally armed with seven rifled muzzle-loading guns, which were among the last of this type to be made at the Woolwich Gun Foundry. These sited at three main gun positions, including W battery containing two guns on 'C' pivots (rotating around a reused Georgian cannon set upright in the ground). Each gun weighed 7 tons and had a charge of gunpowder able to fire a Palliser shot at per second. This could pierce of armour at . It was proposed to replace the guns with larger versions in 1888 but this was never put into action. It had a large, underground, main gunpowder magazine, 15 feet (4.5 m) by 18 feet (5.5 m) by 20 feet (6.1 m) high. The fort was staffed by 50 officers and men of the Coast Brigade, Royal Artillery, but no shots were ever fired in action.