Second World War-era capital ships had three classes of artillery: the heavy main battery, intended to engage opposing battleships and cruisers (280 mm (11 inch) or greater); a secondary battery for use against enemy destroyers of 127 to 155 mm (5 to 6.1 in); heavy anti-aircraft guns of 76 to 127 mm (3 to 5 in), which could create barrages to knock out airplanes at a distance; finally, light rapid-fire anti-aircraft batteries (A/A) to track and bring down aircraft at close range. The light A/A was dispersed throughout the ship and included both automatic cannons (20–40 mm) and heavy machine guns. During World War II, the US Navy, Royal Navy, the French Navy and the Imperial Japanese Navy combined the secondary battery with the heavy anti-aircraft guns, creating a dual-purpose secondary battery. They discarded the dedicated, anti-ship secondary batteries altogether, because a battle-line fleet would be screened against cruiser and destroyers most of the time. Also, it was deemed unlikely that a battleship would be simultaneously facing both rushing destroyers and aircraft, and it would take up too much space to have separate types of guns to deal with both threats. Rather, they replaced them with turret-mounted dual purpose guns that could be used against both aircraft and ships. The space saved from combining the two types of guns added to simplification of supply, increased deck armour coverage, stowage of other equipment, a larger light anti-aircraft battery, and other needs. This arrangement was seen more efficient, and was deemed adequate to meet anti-surface and anti-aircraft needs under most circumstances.
The Kriegsmarine, in a practice similar to the Italian and Soviet navies, adopted a mixed-calibre secondary battery, with dedicated anti-ship guns, coupled with smaller-calibre heavy anti-aircraft batteries, instead of adopting dual-purpose secondaries like the British or Americans. Both navies were concerned of close-range torpedo attacks from enemy (in particular, French) destroyers and torpedo boats, and considered the more powerful, larger calibre anti-ship secondaries a must. The French Navy used a mixed-calibre system, as well, but their secondary battery was dual-purpose. This tended to complicate ammunition supplies and render certain armament useless in some situations.
Dual purpose guns are designed as a compromise between the heavy main armament of a surface combatant and dedicated anti-aircraft guns. Usually of a mid-range caliber, the gun is heavy enough to prove useful against surface targets including ships, surfaced submarines, and land targets. However, it is compact enough to fit into a mounting capable of good traverse and high elevation, as well as being capable of a high rate of fire, allowing it to successfully engage air targets at all angles. For example, a Royal Navy battleship of the King George V class had sixteen QF Mark I 5.25-inch (133 mm) guns that could engage either enemy ships or high level aircraft, as necessary. Not all dual purpose guns have high elevation. The determining factor was whether or not the mounting was provided with an anti-aircraft fire control system and a method for setting the time fuze in the A.A. warhead, fired by the gun. Starting with the Tribal class, the Royal Navy introduced a series of destroyer classes that had dual purpose guns, but in 4.7 inch QF Mark XII, twin CP Mk. XIX and later mountings limited to 40, 50 or 55 degrees elevation, however, the guns were controlled by an A.A. fire control system and the mountings were provided with A.A. shell fuze setters. The USN had developed a similar class of destroyer, the Porter class with eight Mk 12 5 inch/38 caliber (127 mm) guns in four Mark 22 Single Purpose (surface action only) twin mounts, limited to 35 degrees elevation, but with no provision for A.A. fire control and no on-mount fuze setters. The 40 degree elevation did limit the ability of the Tribal class guns to engage dive and high altitude bombers but they were still effective in engaging low altitude, level and torpedo, bombers and could still provide barrage fire over other ships being attacked by dive bombers. Admiral Sir Philip Vian describes the use of 4.7 inch Mark XII guns against aircraft during the 1940 campaign in Norway:
"It became clear at once that in an attack from the air in narrow waters flanked by mountains, the cards were held by the aircraft. There was too little sea-room for full freedom of manoeuvre, and the aircraft's approach was screened by the rock walls. As often as not, when they did come into view it was at such an angle that our 4.7-inch guns, whose maximum elevation was only forty degrees, could not reach them...Aandalsnes is approached through the Romsdal Fiord, and lies forty miles from the entrance, off which we arrived on the 24th April. The daylight passage of the convoy and escort through this waterway, speed five knots, on a steady course and with mountains rising steeply either side, presented an alluring invitation to enemy aircraft. Junkers attacks persisted to the end, but the fire of the destroyers, although limited to an elevation of forty degrees, was enough to keep the enemy just too high for their standard of marksmanship. Not a ship received a direct hit, though some were damaged by the splinters from near misses."
Dual purpose guns, often abbreviated to DP guns, were originally designed as a secondary armament for large surface ships such as cruisers and battleships to complement their heavy main armaments. Later, such guns began to be added to smaller vessels as their primary gun armament, and with the progression of ship design away from heavy caliber guns, today nearly all main gun armaments are of dual purpose nature.
Most DP mounted guns have calibers in the range from three to five inches.
In British service the term HA/LA for "High Angle/Low Angle" was used.
- Hodges, Tribal Class Destroyers, Almark Publishing Co. Ltd, 1971, ISBN 0-85524-047-4, p.32: Diagram of High Level Bomber Attack: A 240mph target, at 12 thousand feet altitude could expect to be under for fire about 75 seconds, from the time it enters the effective range of the HACS until it flies to within the minimum range of a 5.25 gun elevated to 70 degrees. A Tribal class destroyer would be able to engage the same target for about 37 seconds.
- Vian, Philip, Action This Day, London, 1960, p.40 and 44.
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