A blockship is a

ship A ship is a large watercraft, vessel that travels the world's oceans and other Waterway, navigable waterways, carrying cargo or passengers, or in support of specialized missions, such as defense, research and fishing. Ships are generally disti ...

deliberately sunk to prevent a

river A river is a natural stream of fresh water that flows on land or inside Subterranean river, caves towards another body of water at a lower elevation, such as an ocean, lake, or another river. A river may run dry before reaching the end of ...

, channel, or

canal Canals or artificial waterways are waterways or engineered channels built for drainage management (e.g. flood control and irrigation) or for conveyancing water transport vehicles (e.g. water taxi). They carry free, calm surface ...

from being used as a

waterway A waterway is any Navigability, navigable body of water. Broad distinctions are useful to avoid ambiguity, and disambiguation will be of varying importance depending on the nuance of the equivalent word in other ways. A first distinction is ...

. It may either be sunk by a navy defending the waterway to prevent the ingress of attacking enemy forces, as in the case of at

Portland Harbour Portland Harbour is beside the Isle of Portland, Dorset, on the south coast of England. Construction of the harbour began in 1849; when completed in 1872, its surface area made it the largest human-made harbour in the world, and it remains ...

in 1914; or it may be brought by enemy raiders and used to prevent the waterway from being used by the defending forces, as in the case of the three old

cruiser A cruiser is a type of warship. Modern cruisers are generally the largest ships in a fleet after aircraft carriers and amphibious assault ships, and can usually perform several operational roles from search-and-destroy to ocean escort to sea ...

s , and scuttled during the Zeebrugge raid in 1918 to prevent the port from being used by the German navy. An early use was in 1667, during the Dutch

Raid on the Medway The Raid on the Medway, during the Second Anglo-Dutch War in June 1667, was a successful attack conducted by the Dutch navy on English warships laid up in the fleet anchorages off Chatham Dockyard and Gillingham in the county of Kent. At th ...

and their attempts to do likewise in the Thames during the

Second Anglo-Dutch War The Second Anglo-Dutch War, began on 4 March 1665, and concluded with the signing of the Treaty of Breda (1667), Treaty of Breda on 31 July 1667. It was one in a series of Anglo-Dutch Wars, naval wars between Kingdom of England, England and the D ...

, when a number of warships and merchant ships commandeered by the

Royal Navy The Royal Navy (RN) is the naval warfare force of the United Kingdom. It is a component of His Majesty's Naval Service, and its officers hold their commissions from the King of the United Kingdom, King. Although warships were used by Kingdom ...

were sunk in those rivers to attempt to stop the attacking forces. An even earlier use are the six 11th century Skuldelev ships in Roskilde Fjord, sunk to protect

Roskilde Roskilde ( , ) is a city west of Copenhagen on the Danish island of Zealand. With a population of 53,354 (), the city is a business and educational centre for the region and the 10th largest city in Denmark. It is governed by the administrative ...

from northern

Vikings Vikings were seafaring people originally from Scandinavia (present-day Denmark, Norway, and Sweden), who from the late 8th to the late 11th centuries raided, pirated, traded, and settled throughout parts of Europe.Roesdahl, pp. 9� ...

. They are now on display in the Viking Ship Museum. The above is the principal and enduring meaning of 'block ship', but in the mid-19th century the term blockships was applied to two groups of mobile sea batteries developed by the Royal Commission on Coast Defence. The first batch of four was obtained from around 1845 by converting old sailing 74-gun two-deckers, all of them

ships of the line A ship of the line was a type of naval warship constructed during the Age of Sail from the 17th century to the mid-19th century. The ship of the line was designed for the naval tactic known as the line of battle, which involved the two column ...

, into floating batteries, equipped with a steam/screw propulsion system. Also called "steam guardships", these conversions involved cutting down to a single deck, with

ballast Ballast is dense material used as a weight to provide stability to a vehicle or structure. Ballast, other than cargo, may be placed in a vehicle, often a ship or the gondola of a balloon or airship, to provide stability. A compartment within ...

removed, and a

jury rig In maritime transport and sailing, jury rigging or jury-rigging is making temporary makeshift running repairs with only the tools and materials on board. It originates from sail-powered boats and ships. Jury-rigging can be applied to any part o ...

installed with a medium engine for speeds of . These ships, converted in 1846, were , , and . Although these ships were intended for coast defence some of them were used offensively, notably in the Baltic Campaign of 1854 and 1855, where they were an integral part of the British fleet. A second batch of five were similarly obtained from around 1855 by converting other elderly 74-gun ships; these were , , , and . The most recent known use of blockships in warfare was during the

annexation of Crimea by the Russian Federation In February and March 2014, Russia invaded the Crimea, Crimean Peninsula, part of Ukraine, and then annexed it. This took place in the relative power vacuum immediately following the Revolution of Dignity. It marked the beginning of the Russ ...

. On 6 March 2014, the

Russian Navy The Russian Navy is the Navy, naval arm of the Russian Armed Forces. It has existed in various forms since 1696. Its present iteration was formed in January 1992 when it succeeded the Navy of the Commonwealth of Independent States (which had i ...

towed and scuttled the decommissioned cruiser at the entrance to Donuzlav Bay in western

Crimea Crimea ( ) is a peninsula in Eastern Europe, on the northern coast of the Black Sea, almost entirely surrounded by the Black Sea and the smaller Sea of Azov. The Isthmus of Perekop connects the peninsula to Kherson Oblast in mainland Ukrain ...

, to prevent remaining Ukrainian navy vessels from leaving port. Less than 24 hours later, on 7 March, another blockship, the former

Black Sea Fleet The Black Sea Fleet () is the Naval fleet, fleet of the Russian Navy in the Black Sea, the Sea of Azov and the Mediterranean Sea. The Black Sea Fleet, along with other Russian ground and air forces on the Crimea, Crimean Peninsula, are subordin ...

rescue/diving support vessel ''BM-416'' was scuttled near ''Ochakov''. __NOTOC__

Notes

External links

*{{commonscat-inline, Block ships Ship types Naval warfare Shipwrecks by type

See also

Notes

Further reading

External links