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Glacis

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294: 310: 179: 2458: 126: 29: 92:. They may be constructed of earth as a temporary structure or of stone in more permanent structure. More generally, a glacis is any slope, natural or artificial, which fulfils the above requirements. The etymology of this French word suggests a slope made dangerous with ice, hence the relationship with 200:
Towards the end of the medieval period some castles were modified to make them defensible against cannons. Glacis consisting of earthen slopes faced with stones were placed in front of the curtain walls and bastions (towers) to absorb the impact of cannon shots or to deflect them. Towers were lowered
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to be swept more efficiently by minimizing changes to the angle of their guns while firing. Furthermore, the glacis prevents attacking cannon from having a clear shot at the walls of a fortress, as usually these cannot be seen until the glacis is crossed and the ditch, bounded on either side by the
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Early modern European fortresses were so constructed as to keep any potential assailant under the fire of the defenders until the last possible moment. On natural, level ground, troops attacking any high work have a degree of shelter from its fire when close up to it; the glacis consists of a slope
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has two advantages: many projectiles will deflect rather than penetrate; those that attempt to will have to travel on a longer diagonal route through any given thickness of armor than if it were perpendicular to their trajectory.
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or other armored fighting vehicle, often composed of upper and lower halves. In a head-on-head armored engagement, the glacis plate is the largest and most obvious target available to an enemy gunner.
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with a low grade inclined towards the top of the wall. This gave defenders a direct line of sight into the assaulting force, allowing them to efficiently sweep the field with fire from the
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are also designed to detonate directly underneath the glacis plate. As a result, it is generally the thickest, most robust armored section of a tank, followed by the turret face and
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and so that missiles dropped from the battlements would ricochet off the glacis into attacking forces.
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Though defenders on high ground already have a direct line of sight, a glacis allows the
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to the same height as the curtain walls and converted into gun platforms.
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A glacis could also appear in ancient fortresses, such as the one the
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is an artificial slope as part of a medieval castle or in
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describes the sloped front-most section of the hull of a
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started to incorporate glacis around 350 BC. Those at
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Here it was used by them to prevent enemy 802: 784: 730: 716: 634: 625: 616: 607: 598: 170:, Dorset were 25 metres (82 ft) high. 58: 16:Protective slope built into a fortification 566: 552: 173: 477:Caen Castle: A Ten Centuries Old Fortress 120: 520: 382: 239: 177: 124: 27: 453: 397: 2484:Fortification (architectural elements) 2476: 411:"The Terminology of a Fortress:Glacis" 547: 79: 497: 457:"Fortification and Siegecraft"  358: 205:Early modern European fortifications 109:front-most section of the hull of a 32:Diagram showing upward sloped glacis 1958:Weapons Storage and Security System 235: 13: 573: 14: 2500: 299:Iron Age ramparts and ditches in 2457: 2456: 308: 292: 42: 447: 500:Hillforts of England and Wales 425: 403: 1: 1853:British "hedgehog" road block 345: 129:Middle Bronze Age glacis in 7: 2263:Cities with defensive walls 1848:Defensive fighting position 1763: 1568: 1378: 1324: 1185: 1176: 1142: 1133: 988: 328: 10: 2505: 521:Stokstad, Marilyn (2005). 285: 228:smooth, masoned scarp and 208: 18: 2447: 2377: 2301: 2245: 2179: 2065: 1970: 1893:Hardened aircraft shelter 1868:Entry control point (ECP) 1780: 1691: 1407: 1400: 832: 581: 371:Decaëns & Dubois 2010 115:armoured fighting vehicle 2390:Continuity of government 2212:Motte-and-bailey castle 1918:Missile launch facility 1913:Main line of resistance 608: 467:Encyclopædia Britannica 454:Jackson, Louis (1911). 174:Medieval fortifications 90:early modern fortresses 21:Glacis (disambiguation) 2288:Military installations 2152: 2133: 2124: 2115: 2033: 1704: 1679: 1655: 1645:Scarp and Counterscarp 1616: 1607: 1592: 1559: 1545: 1516: 1487: 1478: 1454: 1415: 1220: 1201: 1119: 1068: 1059: 1015: 1006: 997: 934: 920: 911: 857: 816: 803: 794: 785: 771: 731: 717: 653: 644: 635: 626: 617: 599: 249: 186: 137: 121:Ancient fortifications 33: 2057:Floating water castle 1788:Admiralty scaffolding 1081:Fortified buildings ( 243: 181: 128: 31: 2400:Subterranean warfare 1353:Viking ring fortress 498:Dyer, James (1992). 189:Glacis, also called 164:Hillforts in Britain 86:military engineering 19:For other uses, see 2217:Quadrangular castle 1953:Weapon storage area 1309:Quadrangular castle 413:. www.fortadams.org 321:Pyrénées-Orientales 183:Krak des Chevaliers 1948:Underground hangar 1733:Fire control tower 1530:Gunpowder magazine 958:Butter-churn tower 250: 187: 138: 34: 2471: 2470: 2395:Military urbanism 2329:Fortified gateway 2202:Concentric castle 1966: 1965: 1883:Fire support base 1723:Coastal artillery 1598:(Spanish America) 1192: 1034:Concentric castle 142:ancient Egyptians 2496: 2460: 2459: 2453: 2344:National redoubt 2273:Fortified estate 2197:Circular rampart 2157: 2138: 2129: 2120: 2038: 1798:Anti-tank trench 1793:Air raid shelter 1768: 1728:Disappearing gun 1709: 1684: 1660: 1621: 1612: 1597: 1573: 1564: 1550: 1521: 1492: 1483: 1459: 1420: 1405: 1404: 1383: 1363:Bailey (or ward) 1329: 1234:Motte-and-bailey 1225: 1206: 1190: 1182: 1181: 1147: 1138: 1124: 1073: 1064: 1020: 1011: 1002: 993: 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861: 860: 855: 853: 850: 848: 845: 843: 842:Advanced work 840: 839: 837: 835: 831: 825: 822: 818: 813: 810: 807: 806: 801: 798: 797: 792: 789: 788: 783: 781: 778: 775: 774: 769: 767: 766:Refuge castle 764: 761: 758: 756: 753: 751: 748: 746: 743: 741: 738: 735: 734: 729: 727: 724: 721: 720: 715: 713: 710: 708: 705: 703: 700: 698: 695: 693: 690: 688: 685: 683: 680: 678: 675: 673: 670: 668: 665: 663: 660: 657: 656: 651: 648: 647: 642: 639: 638: 633: 630: 629: 624: 621: 620: 615: 612: 611: 606: 603: 602: 597: 595: 592: 590: 587: 586: 584: 580: 576: 569: 564: 562: 557: 555: 550: 549: 546: 538: 536:9780313325250 532: 528: 524: 519: 515: 513:9780747801801 509: 505: 501: 496: 492: 490:9782902685752 486: 482: 478: 473: 469: 468: 463: 458: 452: 451: 438: 434: 428: 412: 406: 399: 394: 392: 385:, p. 84. 384: 383:Stokstad 2005 379: 373:, p. 17. 372: 367: 361:, p. 19. 360: 355: 351: 341: 338: 336: 335:Fortification 333: 332: 322: 318: 311: 306: 302: 301:Maiden Castle 295: 290: 289: 283: 281: 277: 276:tilt-rod fuze 273: 269: 266: 265:Sloped armour 262: 259: 255: 247: 242: 233: 231: 226: 225:field of fire 221: 219: 212: 202: 198: 196: 192: 184: 180: 171: 169: 168:Maiden Castle 165: 161: 159: 155: 154:siege engines 151: 147: 143: 136: 132: 127: 118: 116: 112: 108: 104: 99: 97: 96: 91: 87: 82: 72: 39: 30: 26: 22: 2455: 2410:Siege engine 2378:Other topics 2302:Related word 2268:Defense line 2232:Tower castle 2187:Bastion fort 2171:Urban castle 2099:Ganerbenburg 2097: 2052:Water castle 2028:Ridge castle 2013:Marsh castle 1828:Bomb shelter 1808:Belgian gate 1781:20th century 1692:19th century 1630:Retrenchment 1602:Punji sticks 1511:Entrenchment 1506:Device Forts 1473:Counterguard 1408:Early modern 1338:Tower castle 1274:Powder tower 1249:Outer bailey 1161:Inner bailey 1135:Gulyay-gorod 1120: 1103:Ganerbenburg 1101: 1097:Fujian tulou 1039:Corner tower 978:Chamber gate 948:Bridge tower 796:Trou de loup 522: 499: 476: 465: 448:Bibliography 437:the original 427: 415:. Retrieved 405: 398:Jackson 1911 378: 366: 354: 270: 263: 254:glacis plate 253: 251: 230:counterscarp 222: 214: 211:Bastion fort 199: 188: 162: 139: 103:glacis plate 102: 100: 93: 37: 35: 25: 2309:Castle town 2166:Toll castle 2135:Lustschloss 2117:Kaiserpfalz 2047:Spur castle 2042:Rock castle 1983:Hill castle 1978:Cave castle 1938:Spider hole 1838:Bremer wall 1803:Barbed tape 1699:Barbed wire 1373:Witch tower 1343:Tower house 1333:Toll castle 1319:Shield wall 1239:Murder hole 1128:Guard tower 745:Pincer gate 692:Faussebraye 280:gun mantlet 2478:Categories 2334:Gatekeeper 2154:Ordensburg 2126:Landesburg 1933:Sentry gun 1888:Flak tower 1818:Blast wall 1738:Gun turret 1635:Sally port 1540:Kotta mara 1480:Couvreface 1444:Breastwork 1439:Blockhouse 1417:Abwurfdach 1368:Watchtower 1358:Wall tower 1314:Shell keep 1264:Portcullis 1259:Peel tower 1244:Neck ditch 1203:Landesburg 1151:Half tower 1109:Gate tower 1054:Drawbridge 896:Battlement 812:Wagon fort 655:Chengqiang 346:References 319:Fortress, 317:Mont-Louis 2437:Guerrilla 2180:By design 1928:Revetment 1743:Land mine 1674:Star fort 1501:Crownwork 1496:Covertway 1429:Barricade 1070:Embrasure 983:Chartaque 913:Bergfried 871:Arrowslit 697:Gatehouse 667:City gate 628:Castellum 594:Acropolis 359:Dyer 1992 252:The term 195:escalades 144:built at 113:or other 2462:Category 2452:See also 2339:Loophole 2227:Ringwork 2222:Ringfort 2147:Obstacle 1988:Hillfort 1908:Loophole 1706:Barbette 1681:Tenaille 1664:Sea fort 1594:Presidio 1554:Magazine 1535:Hornwork 1468:Cavalier 1463:Casemate 1456:Caponier 1299:Ringwork 1187:Detinets 1156:Hoarding 1061:Enceinte 936:Bretèche 881:Bartizan 876:Barbican 852:Alcazaba 780:Stockade 760:Ringfort 740:Palisade 712:Landwehr 707:Hillfort 417:June 14, 329:See also 323:, France 315:Glacis, 131:'En Esur 2369:Vedette 2359:Schloss 2324:Festung 2319:Dungeon 2314:Château 2258:Castles 2066:By role 1923:Pillbox 1753:Outpost 1669:Station 1657:Schanze 1640:Sandbag 1625:Redoubt 1609:Ravelin 1577:Palanka 1561:Orillon 1547:Lunette 1489:Coupure 1434:Bastion 1424:Arsenal 1392:Zwinger 1304:Roundel 1294:Ricetto 1269:Postern 1254:Outwork 1178:Kremlin 1049:Curtain 1024:Citadel 1008:Chemise 968:Caltrop 886:Bastion 859:Alcázar 755:Rampart 733:Oppidum 726:Nuraghe 672:Crannog 646:Castros 582:Ancient 464:(ed.). 286:Gallery 218:parapet 105:is the 95:glacier 77:French: 2364:Trench 2354:Picket 1765:Sangar 1718:Bunker 1650:Sconce 1570:Ostrog 1518:Flèche 1401:Modern 1380:Yagura 1348:Turret 1284:Reduit 1222:Merlon 1166:Kasbah 1144:Gusuku 1121:Glacis 1114:Gabion 1083:church 990:Chashi 973:Castle 817:Laager 805:Vallum 762:(Rath) 637:Castra 619:Burgus 589:Abatis 533:  510:  487:  135:Israel 107:sloped 38:glacis 2405:Siege 2349:Palas 2293:Walls 2283:Forts 2246:Lists 2093:Fence 2035:Rocca 1903:Kabal 1618:Redan 1525:Gorge 1449:Canal 1326:Shiro 1289:Ribat 1279:Qalat 1091:Dzong 1087:house 787:Sudis 719:Limes 677:Ditch 610:Broch 601:Agger 460:. In 340:Siege 191:talus 150:Nubia 146:Semna 84:) in 2415:list 1833:Buoy 1387:Yett 1229:Moat 1196:Ksar 1171:Keep 963:Caer 953:Burh 929:Boom 922:Berm 901:Bawn 866:Amba 702:Gord 531:ISBN 508:ISBN 485:ISBN 419:2014 258:tank 246:tank 111:tank 687:Dun 148:in 2480:: 2454:: 1089:, 1085:, 529:. 527:84 506:. 504:19 483:. 481:17 390:^ 282:. 160:. 133:, 117:. 101:A 98:. 75:, 56:eɪ 36:A 1191:) 1183:( 1093:) 820:) 814:( 567:e 560:t 553:v 539:. 516:. 493:. 421:. 400:. 303:. 71:/ 68:s 65:ɪ 62:s 59:. 53:l 50:ɡ 47:ˈ 44:/ 40:( 23:.

Index

Glacis (disambiguation)

/ˈɡl.sɪs/
[ɡlasi]
military engineering
early modern fortresses
glacier
sloped
tank
armoured fighting vehicle

'En Esur
Israel
ancient Egyptians
Semna
Nubia
siege engines
defensive walls
Hillforts in Britain
Maiden Castle

Krak des Chevaliers
talus
escalades
Bastion fort
parapet
field of fire
counterscarp

tank

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