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115:. This allowed safe raising or lowering of the chain, as they were often heavily fortified. By raising or lowering a chain or boom, access could be selectively granted rather than simply rendering the stretch of water completely inaccessible. The raising and lowering could be accomplished by a
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In modern times they usually have civil uses, such as to prevent access to a dangerous river channel. But, especially historically, they have been used militarily, with the goal of denying access to an enemy's ships: a modern example is the
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A boom generally floats on the surface, while a chain can be on the surface or below the water. A chain could be made to float with rafts, logs, ships or other wood, making the chain a boom as well.
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138:. Frequently, however, attackers instead seized the defences and cut the chain or boom by more conventional methods. The boom at the
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Booms or chains could be broken by a sufficiently large or heavy ship, and this occurred on many occasions, including the
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As a key portion of defences, booms were usually heavily defended. This involved shore-based chain towers,
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161:, discouraging assaults on the boom. On some occasions, multiple booms spanned a single stretch of water.
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or variants) is an obstacle strung across a navigable stretch of water to control or block navigation.
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The Naval
History of Great Britain: From the Earliest Times to the Rising of the Parliament in 1779
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Some sources have the chain being dismantled instead of broken by a ship in the
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157:, a boom protecting a harbour could have several ships defending it with their
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Especially in medieval times, the end of a chain could be attached to a
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Booms have also been used to force passing vessels to pay a toll.
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The
History of the Decline and Fall of the Roman Empire, Volume 6
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Crusaders break a chain protecting the harbour (at left) in the
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627:"The Mississippi River in the Civil War Historical Marker"
501:"Filling in the missing links on history of harbour chain"
467:"Site types in the Gatehouse listings — Chain Tower"
407:- a vessel charged with laying anti-submarine nets
638:
605:. Great Britain: Lancer Publishers. p. 24.
602:Medals of the British Navy and How They Were Won
209:Remains of the great chain that protected the
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555:. M.A. de Ruyter Foundation. Archived from
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353:in order to block Union ships during the
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273:, which proved to be useful against the
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142:, for example, was cut by sailors in a
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286:at Carthage was protected by a chain.
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389:, to defend the city and naval base.
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421:- a boom for containing oil spills
247:from Soviet submarines during the
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553:"THE DUTCH IN THE MEDWAY - 1667"
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304:included a chain blocking the
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499:Bob Hind (January 27, 2013).
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316:A chain and boom blocked the
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465:Philip Davis (May 7, 2012).
415:- a boom for collecting logs
337:Battle of Vuelta de Obligado
153:batteries, or forts. In the
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224:A preserved section of the
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578:Hervey, Frederic (1779).
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341:A chain was placed from
243:, built to protect the
331:The chain blocking the
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584:. W Adlard. pp.
269:Defensive system for
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40:
647:Nautical terminology
488:Boom Towers, Norwich
310:A chain spanned the
282:The entrance to the
41:A boom blocking the
30:For other uses, see
27:Navigational barrier
559:on October 21, 2013
513:on October 21, 2013
405:Boom defence vessel
376:Saint Philip Castle
442:raid on the Medway
419:Boom (containment)
400:Anti-submarine net
355:American Civil War
343:Columbus, Kentucky
327:Hudson River Chain
322:Raid on the Medway
297:from 1431 to 1539.
295:Portsmouth Harbour
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226:Hudson River Chain
136:Battle of Vigo Bay
132:raid on the Medway
86:anti-submarine net
50:
599:Long, WH (2010).
438:siege of Damietta
347:Mississippi River
275:Ferrol Expedition
241:Shoeburyness Boom
180:siege of Damietta
128:siege of Damietta
16:(Redirected from
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119:mechanism or a
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103:Historical uses
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541:. p. 510.
533:Gibbon, Edward
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66:harbour chain
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561:. Retrieved
557:the original
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515:. Retrieved
511:the original
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471:. Retrieved
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359:Between the
333:Parana River
318:River Medway
302:Leonine Wall
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62:boom defence
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18:Boom defence
563:October 21,
517:October 17,
473:October 17,
469:. Gatehouse
440:and in the
379: [
364: [
345:across the
335:during the
320:during the
312:Golden Horn
211:Golden Horn
155:Age of Sail
109:chain tower
95:Description
70:river chain
45:during the
43:River Foyle
449:References
261:Historical
159:broadsides
113:boom tower
78:boom chain
74:chain boom
151:artillery
641:Category
506:The News
413:Log boom
394:See also
372:Mugardos
351:Missouri
256:Examples
249:Cold War
144:longboat
134:and the
117:windlass
196:Norwich
165:Gallery
121:capstan
609:
284:Cothon
130:, the
60:(also
426:Notes
385:, in
383:]
368:]
306:Tiber
58:chain
56:or a
607:ISBN
565:2013
519:2013
475:2013
374:and
300:The
54:boom
32:Boom
370:in
349:to
111:or
643::
586:77
535:.
503:.
457:^
431:A.
381:gl
366:gl
146:.
123:.
88:.
76:,
72:,
68:,
64:,
52:A
629:.
615:.
588:.
567:.
521:.
477:.
444:.
277:.
182:.
34:.
20:)
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