QF 12-pounder 12 cwt naval gun

HMS Daring and HMS Decoy together made up the Daring class of torpedo boat destroyers which served with the Royal Navy during the turn of the 19th and 20th centuries. On trial she made headlines as the 'Fastest Boat Ever'. The introduction of steam turbines after 1897 quickly made her and her sisters obsolete and she was sold off in 1912.

Naval trawlers are vessels built along the lines of a fishing trawler but fitted out for naval purposes; they were widely used during the First and Second World Wars. Some—known in the Royal Navy as "Admiralty trawlers"— were purpose-built to naval specifications, others adapted from civilian use. Fishing trawlers were particularly suited for many naval requirements because they were robust vessels designed to work heavy trawls in all types of weather, and had large clear working decks. A minesweeper could be created by replacing the trawl with a mine sweep. Adding depth charge racks on the deck, ASDIC sonar below, and a 3-inch (76 mm) or 4-inch (102 mm) gun in the bow equipped the trawler for anti-submarine duties.

A built-up gun is artillery with a specially reinforced barrel. An inner tube of metal stretches within its elastic limit under the pressure of confined powder gases to transmit stress to outer cylinders that are under tension. Concentric metal cylinders or wire windings are assembled to minimize the weight required to resist the pressure of powder gases pushing a projectile out of the barrel. Built-up construction was the norm for guns mounted aboard 20th century dreadnoughts and contemporary railway guns, coastal artillery, and siege guns through World War II.

In naval terminology, a destroyer is a fast, manoeuvrable, long-endurance warship intended to escort larger vessels in a fleet, convoy, or battle group and defend them against powerful short-range attackers. They were originally developed in 1885 by Fernando Villaamil for the Spanish Navy as a defense against torpedo boats, and by the time of the Russo-Japanese War in 1904, these "torpedo boat destroyers" (TBDs) were "large, swift, and powerfully armed torpedo boats designed to destroy other torpedo boats". Although the term "destroyer" had been used interchangeably with "TBD" and "torpedo boat destroyer" by navies since 1892, the term "torpedo boat destroyer" had been generally shortened to simply "destroyer" by nearly all navies by the First World War.

A torpedo boat is a relatively small and fast naval ship designed to carry torpedoes into battle. The first designs were steam-powered craft dedicated to ramming enemy ships with explosive spar torpedoes. Later evolutions launched variants of self-propelled Whitehead torpedoes.

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 D-class submarine was the Royal Navy's first class of submarines capable of operating significantly beyond coastal waters. They were also the first boats to be fitted with wireless transmitters. Ten were laid down between 1907 and 1910, though only 8 were completed as D-class boats. The final two hulls were completed as British E-class submarine.

The British E-class submarines started out as improved versions of the British D-class submarine. The E class served with the Royal Navy throughout World War I as the backbone of the submarine fleet. The last surviving E class submarines were withdrawn from service by 1922.

Admiral Sir Percy Moreton Scott, 1st Baronet, was a British Royal Navy officer and a pioneer in modern naval gunnery. During his career he proved to be an engineer and problem solver of some considerable foresight, ingenuity and tenacity. He did not, however, endear himself to the Navy establishment for his regular outspoken criticism of the Navy's conservatism and resistance to change and this undoubtedly slowed the acceptance of his most important ideas, notably the introduction of directed firing. In spite of this, his vision proved correct most of the time and he rose to the rank of admiral and amongst other honours was made baronet, a hereditary title.

Field Marshal Frederick Sleigh Roberts, 1st Earl Roberts, was a British Victorian era general who became one of the most successful British military commanders of his time. Born in India to an Anglo-Irish family, Roberts joined the East India Company Army and served as a young officer in the Indian Rebellion during which he was awarded the Victoria Cross for gallantry. He was then transferred to the British Army and fought in the Expedition to Abyssinia and the Second Anglo-Afghan War, in which his exploits earned him widespread fame. Roberts would go on to serve as the Commander-in-Chief, India before leading British Forces for a year during the Second Boer War. He also became the last Commander-in-Chief of the Forces before the post was abolished in 1904.

Newhaven Fort is a Palmerston fort built in the 19th century to defend the harbour at Newhaven, on the south coast of England. It was the largest defence work ever built in Sussex and is now open as a museum.

Gun laying is the process of aiming an artillery piece or turret, such as a gun, howitzer, or mortar, on land, in air, or at sea, against surface or aerial targets. It may be laying for direct fire, where the gun is aimed similarly to a rifle, or indirect fire, where firing data is calculated and applied to the sights. The term includes automated aiming using, for example, radar-derived target data and computer-controlled guns.

The 12 pounder 12 cwt anti-aircraft gun was borrowed for AA use from the QF 12 pounder 12 cwt coast defence gun with the addition of a modified cradle for higher elevation, a retaining catch for the cartridge, and an additional spring recuperator above the barrel and high-angle sights. Writers commonly refer to it simply as "12 pounder anti-aircraft gun". 12 cwt referred to the weight of the barrel and breech [12 × 112 lb (51 kg) = 1,344 lb (610 kg)] to differentiate it from other 12-pounder guns.

World War I or the First World War, often abbreviated as WWI, was one of the deadliest global conflicts in history. It was fought between two coalitions, the Allies and the Central Powers. Fighting occurred throughout Europe, the Middle East, Africa, the Pacific, and parts of Asia. An estimated 9 million soldiers were killed in combat, plus another 23 million wounded, while 5 million civilians died as a result of military action, hunger, and disease. Millions more died as a result of genocide, while the 1918 Spanish flu pandemic was exacerbated by the movement of combatants during the war.

Cordite is a family of smokeless propellants developed and produced in the United Kingdom since 1889 to replace black powder as a military propellant. Like modern gunpowder, cordite is classified as a low explosive because of its slow burning rates and consequently low brisance. These produce a subsonic deflagration wave rather than the supersonic detonation wave produced by brisants, or high explosives. The hot gases produced by burning gunpowder or cordite generate sufficient pressure to propel a bullet or shell to its target, but not so quickly as to routinely destroy the barrel of the gun.

Shrapnel shells were anti-personnel artillery munitions which carried many individual bullets close to a target area and then ejected them to allow them to continue along the shell's trajectory and strike targets individually. They relied almost entirely on the shell's velocity for their lethality. The munition has been obsolete since the end of World War I for anti-personnel use; high-explosive shells superseded it for that role. The functioning and principles behind Shrapnel shells are fundamentally different from high-explosive shell fragmentation. Shrapnel is named after Lieutenant-General Henry Shrapnel (1761–1842), a British artillery officer, whose experiments, initially conducted on his own time and at his own expense, culminated in the design and development of a new type of artillery shell.

Vickers was a British engineering company that existed from 1828 until 1999. It was formed in Sheffield as a steel foundry by Edward Vickers and his father-in-law, and soon became famous for casting church bells. The company went public in 1867, acquired more businesses, and began branching out into military hardware and shipbuilding.

Emperor Meiji , also called Meiji the Great , was the 122nd emperor of Japan according to the traditional order of succession. Reigning from 13 February 1867 to his death, he was the first monarch of the Empire of Japan and presided over the Meiji era. He was the figurehead of the Meiji Restoration, a series of rapid changes that witnessed Japan's transformation from an isolationist, feudal state to an industrialized world power.

The Type 41 3-inch (76 mm) naval gun otherwise known as the 8 cm/40 3rd Year Type naval gun was a Japanese dual-purpose gun introduced before World War I. Although designated as 8 cm (3.15 in), its shells were 76.2 mm (3 in) in diameter.

The metric system is a system of measurement that succeeded the decimalised system based on the metre that had been introduced in France in the 1790s. The historical development of these systems culminated in the definition of the International System of Units (SI) in the mid-20th century, under the oversight of an international standards body. Adopting the metric system is known as metrication.

The Pacific War, sometimes called the Asia–Pacific War, was the theater of World War II that was fought in eastern Asia, the Pacific Ocean, the Indian Ocean, and Oceania. It was geographically the largest theater of the war, including the vast Pacific Ocean theater, the South West Pacific theater, the Second Sino-Japanese War, and the Soviet–Japanese War.

Kiska is one of the Rat Islands, a group of the Aleutian Islands of Alaska. It is about 22 miles (35 km) long and varies in width from 1.5 to 6 miles. It is part of Aleutian Islands Wilderness and as such, special permission is required to visit it. The island has no permanent population.

Kolombangara is an island in the New Georgia Islands group of the nation state of Solomon Islands in the southwestern Pacific Ocean. The name is from a local language, a rough translation of its meaning is "Water Lord" with approximately 80 rivers and streams running down its flanks.

Saipan is the largest island of the Northern Mariana Islands, a commonwealth of the United States in the western Pacific Ocean. According to 2020 estimates by the United States Census Bureau, the population of Saipan was 43,385, a decline of 10% from its 2010 count of 48,220.

Tarawa is an atoll and the capital of the Republic of Kiribati, in the Micronesia region of the central Pacific Ocean. It comprises North Tarawa, which has 6,629 inhabitants and much in common with other more remote islands of the Gilberts group, and South Tarawa, which has 56,388 inhabitants as of 2015, half of the country's total population. The atoll was the site of the Battle of Tarawa during World War II.

Tinian is one of the three principal islands of the Commonwealth of the Northern Mariana Islands. Together with uninhabited neighboring Aguiguan, it forms Tinian Municipality, one of the four constituent municipalities of the Northern Marianas. Tinian's largest village is San Jose.

Newhaven Fort is a Palmerston fort built in the 19th century to defend the harbour at Newhaven, on the south coast of England. It was the largest defence work ever built in Sussex and is now open as a museum.

Mikasa (三笠) is a pre-dreadnought battleship built for the Imperial Japanese Navy (IJN) in the late 1890s. Named after Mount Mikasa in Nara, Japan, the ship served as the flagship of Vice Admiral Tōgō Heihachirō throughout the Russo-Japanese War of 1904–1905, including the Battle of Port Arthur on the second day of the war and the Battles of the Yellow Sea and Tsushima. Days after the end of the war, Mikasa's magazine accidentally exploded and sank the ship. She was salvaged and her repairs took over two years to complete. Afterwards, the ship served as a coast-defence ship during World War I and supported Japanese forces during the Siberian Intervention in the Russian Civil War.

HMS Campbeltown was a Town-class destroyer of the Royal Navy during the Second World War. She was originally US destroyer USS Buchanan, and was one of 50 obsolescent U.S. Navy destroyers transferred to the Royal Navy in 1940 as part of the Destroyers for Bases Agreement. Campbeltown became one of the most famous of these ships when she was used in the St Nazaire Raid in 1942.

Saint-Nazaire is a commune in the Loire-Atlantique department in western France, in traditional Brittany.

The Sri Lanka Volunteer Naval Force (SLVNF) is the active-duty volunteer reserve force of the Sri Lanka Navy. The SLVNF, which consists of the volunteer force and the volunteer reserve is separate from the Regular Naval Force, which consists of the Regular Force consisting of professional naval officers and sailors, and its Regular Reserve, which comprises personal who have a mobilization obligation following their service in the regular force.