I-class destroyer

The G- and H-class destroyers were a group of 18 destroyers built for the Royal Navy during the 1930s. Six additional ships being built for the Brazilian Navy when World War II began in 1939 were purchased by the British and named the Havant class. The design was a major export success with other ships built for the Argentine and Royal Hellenic Navies. They were assigned to the Mediterranean Fleet upon completion and enforced the Non-Intervention Agreement during the Spanish Civil War of 1936–1939.

HMS Hero was an H-class destroyer built for the Royal Navy in the mid-1930s. During the Spanish Civil War of 1936–1939 the ship enforced the arms blockade imposed by Britain and France on both sides as part of the Mediterranean Fleet. During the first few months of World War II, Hero searched for German commerce raiders in the Atlantic Ocean and participated in the Second Battle of Narvik during the Norwegian Campaign of April–June 1940 before she was transferred to the Mediterranean Fleet in May where she escorted a number of convoys to Malta. The ship took part in the Battle of Cape Spada in July 1940, Operation Abstention in February 1941, and the evacuations of Greece and Crete in April–May 1941.

HMS Hereward, named after Hereward the Wake, was an H-class destroyer built for the Royal Navy in the mid-1930s. She was assigned to the Mediterranean Fleet before and the ship spent four months during the Spanish Civil War in mid-1937 in Spanish waters, enforcing the arms blockade imposed by Britain and France on both sides of the conflict. When the Second World War began in September 1939, the ship was in the Mediterranean, but was shortly transferred to the South Atlantic to hunt for German commerce raiders and blockade runners, capturing one of the latter in November. Hereward was transferred to the Home Fleet in May 1940 and rescued Queen Wilhelmina of the Netherlands after the Germans had invaded.

A ballast tank is a compartment within a boat, ship or other floating structure that holds water, which is used as ballast to provide hydrostatic stability for a vessel, to reduce or control buoyancy, as in a submarine, to correct trim or list, to provide a more even load distribution along the hull to reduce structural hogging or sagging stresses, or to increase draft, as in a semi-submersible vessel or platform, or a SWATH, to improve seakeeping. Using water in a tank provides easier weight adjustment than the stone or iron ballast used in older vessels, and makes it easy for the crew to reduce a vessel's draft when it enters shallower water, by temporarily pumping out ballast. Airships use ballast tanks mainly to control buoyancy and correct trim.

A depth charge is an anti-submarine warfare (ASW) weapon. It is intended to destroy a submarine by being dropped into the water nearby and detonating, subjecting the target to a powerful and destructive hydraulic shock. Most depth charges use high explosive charges and a fuze set to detonate the charge, typically at a specific depth. Depth charges can be dropped by ships, patrol aircraft, and helicopters.

Anti-submarine warfare is a branch of underwater warfare that uses surface warships, aircraft, submarines, or other platforms, to find, track, and deter, damage, or destroy enemy submarines. Such operations are typically carried out to protect friendly shipping and coastal facilities from submarine attacks and to overcome blockades.

A minelayer is any warship, submarine or military aircraft deploying explosive mines. Since World War I the term "minelayer" refers specifically to a naval ship used for deploying naval mines. "Mine planting" was the term for installing controlled mines at predetermined positions in connection with coastal fortifications or harbor approaches that would be detonated by shore control when a ship was fixed as being within the mine's effective range.

Anti-aircraft warfare, counter-air or air defence forces is the battlespace response to aerial warfare, defined by NATO as "all measures designed to nullify or reduce the effectiveness of hostile air action". It includes surface based, subsurface, and air-based weapon systems, associated sensor systems, command and control arrangements, and passive measures. It may be used to protect naval, ground, and air forces in any location. However, for most countries, the main effort has tended to be homeland defence. NATO refers to airborne air defence as counter-air and naval air defence as anti-aircraft warfare. Missile defence is an extension of air defence, as are initiatives to adapt air defence to the task of intercepting any projectile in flight.

The Oerlikon 20 mm cannon is a series of autocannons, based on an original German Becker Type M2 20 mm cannon design that appeared very early in World War I. It was widely produced by Oerlikon Contraves and others, with various models employed by both Allied and Axis forces during World War II. Many versions of the cannon are still used today.

The Vickers machine gun or Vickers gun is a water-cooled .303 British (7.7 mm) machine gun produced by Vickers Limited, originally for the British Army. The gun was operated by a three-man crew but typically required more men to move and operate it: one fired, one fed the ammunition, the others helped to carry the weapon, its ammunition, and spare parts. It was in service from before the First World War until the 1960s, with air-cooled versions of it on many Allied World War I fighter aircraft.

The Hedgehog was a forward-throwing anti-submarine weapon that was used primarily during the Second World War. The device, which was developed by the Royal Navy, fired up to 24 spigot mortars ahead of a ship when attacking a U-boat. It was deployed on convoy escort warships such as destroyers and corvettes to supplement the depth charges.

Ceremonial ship launching involves the performance of ceremonies associated with the process of transferring a vessel to the water. It is a nautical tradition in many cultures, dating back thousands of years, to accompany the physical process with ceremonies which have been observed as public celebration and a solemn blessing, usually but not always, in association with the launch itself.

HMS Icarus was one of nine I-class destroyers built for the Royal Navy during the 1930s.

Clydebank is a town in West Dunbartonshire, Scotland. Situated on the north bank of the River Clyde, it borders the village of Old Kilpatrick to the west, and the Yoker and Drumchapel areas of the adjacent City of Glasgow immediately to the east. Depending on the definition of the town's boundaries, the suburban areas of Duntocher, Faifley and Hardgate either surround Clydebank to the north, or are its northern outskirts, with the Kilpatrick Hills beyond.

HMS Ilex was one of nine I-class destroyers destroyer built for the Royal Navy during the 1930s. She is the only ship of the Royal Navy ever to have been named after Ilex, the genus of flowering plants commonly known as holly.

HMS Imogen was a I-class destroyer built for the Royal Navy in the mid-1930s. During the Spanish Civil War of 1936–1939, the ship enforced the arms blockade imposed by Britain and France on both sides as part of the Mediterranean Fleet. After the start of the Second World War the ship was transferred to Home Fleet and participated in the Norwegian Campaign in April 1940. Imogen sank two German submarines before her own sinking following an accidental collision in July 1940.

HMS Imperial was one of nine I-class destroyers built for the Royal Navy during the 1930s. She was scuttled by HMS Hotspur in 1941 after she had been crippled by Italian bombers.

HMS Hotspur was an H-class destroyer built for the Royal Navy during the 1930s. During the Spanish Civil War of 1936–1939 the ship spent considerable time in Spanish waters, enforcing the arms blockade imposed by Britain and France on both sides of the conflict. During the Norwegian Campaign of the Second World War, she fought in the First Battle of Narvik in April 1940 where she was badly damaged. After her repairs were completed, Hotspur was transferred to Gibraltar where she participated in the Battle of Dakar in September. A month later the ship was badly damaged when she rammed and sank an Italian submarine. She received permanent repairs in Malta and was transferred to the Mediterranean Fleet when they were finished in early 1941. Hotspur participated in the Battle of Cape Matapan in March and evacuated British and Australian troops from both Greece and Crete in April–May. In June the ship participated in the Syria-Lebanon Campaign and was escorting convoys and the larger ships of the Mediterranean Fleet until she was transferred to the Eastern Fleet in March 1942.

HMS Impulsive was an I-class destroyer built for the Royal Navy during the 1930s. She saw service in World War II before being scrapped in 1946. She has been the only ship of the Navy to bear this name.

Cowes is an English seaport town and civil parish on the Isle of Wight. Cowes is located on the west bank of the estuary of the River Medina, facing the smaller town of East Cowes on the east bank. The two towns are linked by the Cowes Floating Bridge, a chain ferry.

HMS Inglefield was an I-class destroyer leader built for the Royal Navy that served during World War II. She was the navy's last purpose-built flotilla leader. She was named after the 19th century Admiral Sir Edward Augustus Inglefield (1820–1894), and is so far the only warship to carry the name of that seafaring family. In May 1940, her pennant number was changed to I02.

Birkenhead is a town in the Metropolitan Borough of Wirral, Merseyside, England; historically, it was part of Cheshire until 1974. The town is on the Wirral Peninsula, along the south bank of the River Mersey, opposite Liverpool. At the 2011 census, it had a population of 88,818.

A glide bomb or stand-off bomb is a standoff weapon with flight control surfaces to give it a flatter, gliding flight path than that of a conventional bomb without such surfaces. This allows it to be released at a distance from the target rather than right over it, allowing a successful attack without the aircraft needing to survive until reaching the target.