were arranged with five guns on the centreline, four of which were in superfiring pairs fore and aft of the superstructure, the fifth gun was further aft on the quarterdeck, and the last two as wing guns abreast the aft funnel. To make room for her flight decks, HMS Vindictive was completed with just four guns, one forward, two in the wing positions, and one right aft. Further revisions to the number and layout of the main guns would be made subsequently. , and Hawkins had their guns controlled by a mechanical Mark I Dreyer Fire-control Table. It used data provided by the coincidence rangefinder in the pedestal-type gunnery director positioned under the spotting top at the head of the tripod mast. The ships were also fitted with one and a rangefinder. Effingham and Frobisher were fitted with a Mark III Dreyer Fire-control Table and three 12-foot rangefinders. The secondary armament of the class was intended to consist of ten 20 cwt Mk I guns. Six of these were in low-angle mounts to defend against torpedo boat attack, two in casemates between the forward 7.5-inch guns, another pair on platforms abreast the conning tower and two on a platform between the funnels. The last four served as anti-aircraft (AA) guns and were positioned further aft around the base of the mainmast. They fired shells at a muzzle velocity of . Each gun was provided with 300 rounds. In practice, the secondary armament of each ship varied. At most, only Hawkins and Raleigh completed with the intended guns, and if so, they were promptly modified. No low-angle guns were fitted in Effingham or Frobisher and their high-angle guns were replaced by three Mk V guns on high-angle HA Mark III mountings. A pair of these were positioned at the base of the mainmast and the third gun was on the quarterdeck. At an elevation of +30°, their shells had a range of at a muzzle velocity of . The rest of their anti-aircraft suite consisted of a pair of 2-pounder () AA guns that were added during construction. The Hawkins-class ships were designed with a submerged 21-inch (533 mm) torpedo tube on each broadside, but two above-water torpedo tubes were added below the base of the mainmast during construction on each broadside. Armour The Hawkins class were protected by a full-length waterline armoured belt of high-tensile steel (HTS) that covered most