A deck gun is a type of naval artillery mounted on the deck of a submarine. Most submarine deck guns were open, with or without a shield; however, a few larger submarines placed these guns in a turret.
The main deck gun was a dual-purpose weapon used to sink merchant shipping or shell shore targets, or defend the submarine on the surface from enemy aircraft and warships. Typically a crew of three operated the gun, while others were tasked with supplying ammunition. A small locker box held a few 'ready-use' rounds. With a well-drilled, experienced crew, the rate of fire of a deck gun could be 15 to 18 aimed shots per minute.
Some submarines also had additional deck guns like auto-cannons and machine guns for anti-aircraft defense.
While similar unenclosed guns are often found on surface warships as secondary or defensive armament (such as the US Navy's 5-inch (127 mm)/25 caliber gun which was removed from battleships to mount on submarines), the term "deck gun" normally refers only to such weapons when mounted on submarines.
The deck gun was introduced in all submarine forces prior to World War I. However, it came to the fore in the German navy, and proved its worth when U-boats needed to conserve torpedoes or attack enemy vessels straggling behind a convoy. Submarine captains often considered the deck gun as their main weapon, using much more expensive but not always accurate torpedoes only when necessary or advisable (as a deck gun necessarily revealed a submarine's position, whereas a torpedo could be used either under water or effectively at night). In addition, submarines carried many more gun rounds than torpedoes - ten or fewer during World War I, fired in spreads of multiple warheads to increase the likelihood of a successful hit.
An example of this approach was Lothar von Arnauld de la Perière, who used a deck gun or a dynamiting team on 171 of his 194 sinkings.
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Defensively equipped merchant ship (DEMS) was an Admiralty Trade Division programme established in June 1939, to arm 5,500 British merchant ships with an adequate defence against enemy submarines and aircraft. The acronym DEMS was used to describe the ships carrying the guns, the guns aboard the ships, the military personnel manning the guns, and the shore establishment supporting the system.
The 3"/50 caliber gun (spoken "three-inch fifty-caliber") in United States naval gun terminology indicates the gun fired a projectile in diameter, and the barrel was 50 calibers long (barrel length is 3 in × 50 = ). Different guns (identified by Mark numbers) of this caliber were used by the U.S. Navy and U.S. Coast Guard from 1900 through to 1990 on a variety of combatant and transport ship classes. The gun is still in use with the Spanish Navy on Serviola-class patrol boats.
A fleet submarine is a submarine with the speed, range, and endurance to operate as part of a navy's battle fleet. Examples of fleet submarines are the British First World War era K class and the American World War II era Gato class. The term has survived in Britain to refer to modern nuclear-powered attack submarines. In the United States Navy, the term came to be used primarily for the long-range submarines that served in World War II.