A minesweeper is a small naval warship designed to engage in minesweeping, the use of various mechanisms intended to counter the threat posed by naval mines. Minesweepers keep waterways clear for shipping.
Although naval warfare has a long history, naval mines were not deployed until 1855 in the Crimean War. The first minesweepers date to that war and consisted of British rowboats trailing grapnels to snag the mines. Despite the use of mines in the American Civil War, there are no records of effective minesweeping being used. Officials in the Union Army attempted to create the first minesweeper but were plagued by flawed designs and abandoned the project. Minesweeping technology picked up in the Russo-Japanese War, where aging torpedo boats were pressed into sweeping service in 1908 and more boats were purchased for the purpose the following year.
In Britain, naval leaders recognized before the outbreak of World War I that the development of sea mines was a threat to the nation's shipping and began efforts to counter the threat. Sir Arthur Wilson noted the real threat of the time was blockade aided by mines and not invasion. The function of the fishing fleet's trawlers with their trawl gear was recognized as having a natural connection with mine clearance and, among other things, trawlers were used to keep the English Channel clear of mines. A Trawler Section of the Royal Navy Reserve became the predecessor of the mine sweeping forces with specially designed ships and equipment to follow. These reserve Trawler Section fishermen and their trawlers were activated, supplied with mine gear, rifles, uniforms and pay as the first minesweepers. The dedicated, purpose-built minesweeper first appeared during World War I with the Flower-class minesweeping sloop. By the end of the War, naval mine technology had grown beyond the ability of minesweepers to detect and remove.
Minesweeping made significant advancements during World War II. Combatant nations quickly adapted ships to the task of minesweeping, including Australia's 35 civilian ships that became Auxiliary Minesweepers. Both Allied and Axis countries made heavy use of minesweepers throughout the war. Historian Gordon Williamson wrote that "Germany's minesweepers alone formed a massive proportion of its total strength, and are very much the unsung heroes of the Kriegsmarine." Naval mines remained a threat even after the war ended, and minesweeping crews were still active after VJ Day. After the Second World War, allied countries worked on new classes of minesweepers ranging from 120 ton designs for clearing estuaries to 735 ton ocean going vessels. The United States Navy even used specialized Mechanized Landing Craft to sweep shallow harbors in and around North Korea.
Operation and requirements
Minesweepers are equipped with mechanical or influence sweeps to detonate mines. The modern minesweeper is designed to reduce the chances of it detonating mines itself; it is soundproofed to reduce its acoustic signature and often constructed using wood, fiberglass or non-ferrous metal, or is degaussed to reduce its magnetic signature.
Mechanical sweeps are devices designed to cut the anchoring cables of moored mines, and preferably attach a tag to help the subsequent localization and neutralization. They are towed behind the minesweeper, and use a towed body (e.g. oropesa, paravane) to maintain the sweep at the desired depth and position. Influence sweeps are equipment, often towed, that emulate a particular ship signature, thereby causing a mine to detonate. The most common such sweeps are magnetic and acoustic generators.
There are two modes of operating an influence sweep: MSM (mine setting mode) and TSM (target simulation mode or target setting mode). MSM sweeping is founded on intelligence on a given type of mine, and produces the output required for detonation of this mine. If such intelligence is unavailable, the TSM sweeping instead reproduces the influence of the friendly ship that is about to transit through the area. TSM sweeping thus clears mines directed at this ship without knowledge of the mines. However, mines directed at other ships might remain. 
The minesweeper differs from a minehunter; the minehunter actively detects and neutralises individual mines. Minesweepers are in many cases complementary to minehunters, depending on the operation and the environment; a minesweeper is, in particular, better suited to clearing open-water areas with large numbers of mines. Both kinds of ships are collectively called mine countermeasure vessels (MCMV), a term also applied to a vessel that combines both roles. The first such ship was HMS Wilton, also the first warship to be constructed from fiberglass.
- HNLMS Abraham Crijnssen – famous for her escape from Surabaya in 1942 disguised as a tropical island
- HMS Bronington – formerly commanded by HRH Prince Charles, Prince of Wales
- Calypso – research vessel of Jacques-Yves Cousteau; the ex-Royal Navy BYMS-class vessel J826
- USS Hazard – museum ship at Omaha, Nebraska
- HMS Wilton – the first combined MCMV and the first warship constructed from GRP. Now converted to a yacht club's club house and moored on the foreshore between Leigh-on-Sea and Westcliff in Essex, England
- USS Lucid - The last surviving U.S. Navy MSO hull, it is in process of being restored as a museum
- USS Guardian - Grounded on a reef in the Philippines in 2013.
- HMCS Bras d'Or - Royal Canadian Navy minesweeper lost in the Gulf of St. Lawrence.
- List of minesweeper classes
- Naval Mine
- List of mine warfare vessels of the United States Navy
- List of mine countermeasure vessels of the Royal Navy
- Bruhn, David D.. (2006). Wooden Ships and Iron Men: The U.S. Navy's Ocean Minesweepers, 1953-1994. Heritage Books. ISBN 978-0-7884-3260-6.
- Bruhn, David D.. (2009). Wooden Ships and Iron Men: The U.S. Navy's Coastal and Motor Minesweepers, 1941-1953. Heritage Books. ISBN 0-7884-4909-5.
- Lund & Ludlam. (1978) Out Sweeps! The Story of the Minesweepers in World War II. Foulsham/New English Library ISBN 0450044688. Minesweeping by the wartime Royal Navy.
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- Williamson, Gordon (2012). Kriegsmarine Coastal Forces. Osprey Publishing. pp. 48. ISBN 9781782000006. http://books.google.com/books?id=CEvHjyugb3MC.
- Grant, Roderick M., ed (January 1946). "Sweeping up sudden death". pp. 28–34. ISSN 0032-4558.
- Jane's (1997). "Mine Countermeasures". Jane's War at Sea 1897-1997: 100 Years of Jane's Fighting Ships (100 ed.). HarperCollins. pp. 224. http://books.google.com/books?id=dkDkTc56w8MC. Retrieved 15 October 2012.
- Dempewolff, Richard F. (February 1952). "Mother of the minesweepers". In Grant, Roderick M.. Hearst Magazines. pp. 97–104. ISSN 0032-4558. http://books.google.com/books?id=8dwDAAAAMBAJ. Retrieved 15 October 2012.
- Cavas, Christopher P. (March 15, 2012). "U.S. doubling minesweepers in Persian Gulf". http://www.navytimes.com/news/2012/03/dn-us-doubling-minesweepers-in-persian-gulf-031512/. Retrieved 15 October 2012.
- "Four U.S. Navy minesweepers arrive in the Gulf". 25 June 2012. http://www.reuters.com/article/2012/06/25/gulf-navy-mines-idUSL5E8HP1CQ20120625. Retrieved 15 October 2012.
- "Minesweepers". How it works : science and technology. (3rd ed. ed.). New York: Marshall Cavendish. 2003. pp. 2633. ISBN 0-7614-7333-5. http://books.google.com/books?id=fQ5vOMYlKRIC. Retrieved 15 October 2012.
- Dick Linssen and Åshild Bergh (2000): "Target Simulation Mode Mine Sweeping - SWEEPOP", pamphlet, 4 pages, TNO Physics and Electronics Laboratory, The Netherlands.
- P A Brodtkorb, B-E Marthinsen, M Nakjem, R Fardal (2005): "Royal Norwegian Navy (RNoN) introduces new mine sweeping capabilities", Undersea Defence Technology (UDT) Europe, conf. proc., Amsterdam.
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