| Name |
Description |
#books |
| 4.7 inch QF Mark IX & XII Naval Gun |
A 4.7-inch (120 mm) naval gun which armed the majority of Royal Navy and Commonwealth destroyers in WW2. | 1 |
| Acoustic Mine |
TBD. | 1 |
| Acoustic torpedo |
A torpedo that aims itself by listening for characteristic sounds of its target or by searching for it using sonar. Germany began widespread use this weapon from Sept 1943 to attack escort vessels and merchant ships. | 1 |
| Admiral Hipper-class Cruiser |
A group of five German heavy cruisers built by Nazi Germany's Kriegsmarine from the mid-1930s. It comprised of the Admiral Hipper, Blücher, Prinz Eugen, Seydlitz, and Lützow. | 1 |
| Algerine-class Minesweeper |
TBD. | 1 |
| Anti-submarine warfare |
A branch of underwater warfare that uses surface warships, aircraft, and other submarines to find, track and damage, deter or destroy enemy submarines. | 6 |
| ASDIC (Sonar) |
A technique that uses sound propagation to navigate, communicate with or detect objects on or under the surface of the water, such as other vessels. Early British devices were developed during WW1 and given the name ASDIC. | 2 |
| Baffle Nets |
A line of nets designed to stop torpedoes that is not a continuous net but a series of smaller overlapping pieces offset to allow for vessels to pass through. | 1 |
| Bangor-class Minesweeper |
TBD. | 1 |
| BL 15 inch Mk I naval gun |
A Royal Navy 15 inch gun design; the most widely used and longest lasting of any British designs. It was deployed on capital ships from 1915 until 1959, and was a key Royal Navy gun in both World Wars. | 1 |
| Broadside |
This refers to one side of a warship. It is also commonly used to mean the simultaneous firing of all the guns on one side of warship. | 4 |
| Capitani Romani-class Cruiser |
A class of Italian light cruisers acting as flotilla leaders for the Italian navy. They were designed to outrun and outgun the large new French destroyers of the Le Fantasque and Mogador classes. | 1 |
| Captain-class frigate |
The designation given to 78 frigates of the Royal Navy, constructed in the United States of America, launched in 1942–1943 and delivered to the United Kingdom under the provisions of the Lend-Lease agreement. | 1 |
| Depth Charge |
An anti-submarine warfare weapon intended to destroy a submarine by being dropped into the water nearby and detonating, subjecting the target to a destructive hydraulic shock. Most depth charges use a fuze set to detonate the charge, typically at a specific depth. | 7 |
| Duca d’Aosta-class Cruiser |
A sequence of Italian light cruiser classes of the Regia Marina with ships named after historical military commanders. The classes named after the first ships were class Giussano, Cadorna, Montecuccoli, Duca d'Aosta and Duca degli Abruzzi. | 1 |
| E-class Submarine |
An improved versions of the British D-class submarine, serving with the Royal Navy throughout WW1 as the backbone of the submarine fleet. | 1 |
| Flower-class Sloop |
TBD. | 1 |
| H-class Submarine |
A British submarine constructed between 1915 and 1919 to mine waters, sink coastal shipping and attack German submarines operating in British waters. | 1 |
| Halcyon-class Minesweeper |
TBD. | 1 |
| Hedgehog Anti-Submarine Weapon |
A forward-throwing anti-submarine weapon that was used during the Battle of the Atlantic in WW2. It fired up to 24 spigot mortars ahead of a ship when attacking a U Boat and was deployed on convoy escort warships such as destroyers and corvettes to supplement the depth charges. | 1 |
| Human Torpedo |
A type of diver propulsion vehicle on which the diver rides, generally in a seated position. They were used as secret naval weapons in WW2. | 1 |
| Hunt-class Minesweeper |
TBD. | 1 |
| Hunter-killer Support Groups |
A grouping of anti-submarine warships actively deployed to attack German U-boats in the Battle of the Atlantic during WW2. It would typically be formed around an escort carrier to provide aerial reconnaissance and air cover. | 1 |
| Hydrophone |
A microphone designed to be used underwater for recording or listening to underwater sound. Most hydrophones are based on a piezoelectric transducer that generates electricity when subjected to a pressure change. | 2 |
| Hydrostatic Valve |
A control mechanism developed for the depth control of torpedoes and mines via a mechanism that senses pressure. | 2 |
| K-class Submarine |
A class of British steam-propelled submarines designed in 1913. Designed as large, fast vessels to operate with the battle fleet, they gained the nickname 'Kalamity class' for being involved in many accidents. | 1 |
| Kuma-class Cruiser |
A class of Japanese light cruisers built for and operated by the Imperial Japanese Navy between 1917 and 1921. They included the Kuma, Tama, Kitakami, Ōi and Kiso. | 1 |
| L-class Submarine |
A class of British submarine originally planned as an improved version of the E-class submarine, but later changed to become a separate class. | 1 |
| Leigh light |
A British WW2 anti-submarine device used in the Battle of the Atlantic which was a powerful carbon arc searchlight of 24 inches diameter fitted to a number of the RAFs Coastal Command patrol bombers to help them spot surfaced German U-boats at night. | 1 |
| Leipzip-class Cruiser |
A class of two German light cruisers of the German Reichsmarine and later Kriegsmarine. It comprised the Leipzig (completed 1931) and Nürnberg (completed 1935). The ships were improvements over the preceding Königsberg-class cruisers. | 1 |
| Littorio-class Battleship |
A class of Italian battleship of the Regia Marina. It was composed of four ships built between 1934 and 1942; Littorio, Vittorio Veneto, Roma, and Impero. | 1 |
| M-class Submarine |
A small class of British diesel-electric submarines built during WW1. They had a 12-inch (305 mm) gun mounted in a turret forward of the conning tower. | 1 |
| Magnetic mine |
A self-contained explosive device placed in water to damage or destroy surface ships or submarines. They are deposited and left to wait until they are triggered by an enemy vessel. | 3 |
| Naval Warfare |
Warfare in and on the sea, the ocean, or any other battle space involving a major body of water such as a large lake or wide river. | 2 |
| Naval Wolfpack |
A group of submarines working together to use mass-attack tactics against convoys. It was first used to describe tactics used by German U-boats of the German Navy during the Battle of the Atlantic. | 1 |
| Paravane |
A form of towed underwater 'glider' developed to destroy naval mines, the paravane would be strung out and streamed alongside the towing ship, normally from the bow. | 2 |
| Periscope’s Feather |
The wave created by the periscope or snorkel of a submarine whilest moving through the water. It can be spotted in calm seas. | 1 |
| Periscope |
An instrument for observation over, around or through an object or obstacle that prevents direct line-of-sight observation. Simple ones were used in the trenches during WW1 and more complex periscopes operate on submarines. | 3 |
| QF 12 pounder 12 cwt naval gun |
A versatile 3-inch calibre naval gun produced by 'Armstrong Whitworth, Elswick' and used on Royal Navy warships until the middle of the 20th century. | 3 |
| QF 2-pounder Naval Gun |
A 40mm (1.6 in) British autocannon, used famously as an anti-aircraft gun by the Royal Navy and universally known as the pom-pom. | 3 |
| River-class Submarine |
A class of British submarine named after rivers of the UK and comprised of the Thames, Severn and Clyde. They were designed as 'fleet submarines', which meant being able to manage somewhere around 20 knots. | 1 |
| S-class Submarine |
A class of British submarines built in the early 1930s as smaller boats to patrol the restricted waters of the North Sea and the Mediterranean Sea, replacing the British H-class submarines. A total of 62 were constructed over a period of 15 years. | 1 |
| Salvoe |
The refers to the act of firing several guns during a battle. | 5 |
| Snowflake parachute flare |
A multi-flare signal rocket that contain 28 white stars. They were developed to ease the identification of U-Boats on the surface during darkness, with the wide spread of 28 stars making the submarine stand out in the darkness. | 1 |
| Squid Anti-Submarine Weapon |
A British WW2 ship-mounted anti-submarine weapon consisting of a three-barrelled mortar which launched depth charges. It replaced the Hedgehog system and was credited with sinking 17 submarines in 50 attacks. | 1 |
| Submarine snorkel |
A device which allows a submarine to operate submerged while still taking in air from above the surface. It was widely used on German U-boats during the last year of WW2 and allowed them to charge their batteries without being visible on the surface. | 1 |
| T-class Submarine |
A class of British diesel-electric submarines (Triton class) designed in the 1930s to replace the O, P, and R classes. Fifty-three members of the class were built just before and during WW2. | 1 |
| Torpedo |
This is a self-propelled weapon with an explosive warhead, launched above or below the water surface and propelled underwater towards a target. | 10 |
| Torpex |
A secondary explosive 50% more powerful than TNT by mass used in WW2 from late 1942, having been originally developed by the British for use in torpedoes, with its name being short for 'Torpedo Explosive'. It has since been superseded by H6 and PBX. | 1 |
| Type XIV U-boat Tanker |
A large type of U-Boat designed to resupply other U-boats commonly nicknamed 'milk cows'. It could resupply other boats with fuel, motor oil, torpedoes and refrigerated fresh food. They had no torpedo tubes or deck guns, only anti-aircraft guns. | 1 |
| U-class Submarine |
A class of British small submarines built just before and during WW2, sometimes known as the Undine class after the first of the 49 crafts built. | 1 |
| Underwater Warfare |
Combat conducted underwater including submarines actions, anti-submarine warfare, dive-bombs, torpedo-missiles and diving sabotage against ships and ports. | 2 |
| Vickers .50 machine gun |
A larger-calibre 0.5 inch machine gun similar to the .303 inches Vickers machine gun which was commonly used as an anti-aircraft weapon on Royal Navy and allied ships, typically in a four-gun mounting. | 3 |
