Knowledge (XXG)

Mid-Atlantic gap

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361:(Rotterdam Device, named for where it was captured). Coastal Command's first ASV.III-equipped patrol took place over the Bay of Biscay 1 March. ASV.III made its first U-boat contact on the night of 17 March, but the carrier Wellington suffered a malfunction of its Leigh Light and was unable to press home the attack. The first attack using the system occurred the next night. When ASV.III did enter service, German submariners, right up to Dönitz, began to mistakenly believe British aircraft were homing on emissions from the Metox receiver, which no longer gave warning. Meantime, German scientists were perfecting the 22: 242:
offensive in the Bay of Biscay or to abandon the bombing of German bases by the RAF." "The number of VLR aircraft operating in the North Atlantic in February was only 18, and no substantial increase was made until after the crisis of March." Nor were night air patrols, recognized as necessary, initiated until the autumn of 1943.
432:, the number of VLRs in Newfoundland finally increased. "Canadians had been pressing hard for Liberators since autumn 1942, against British doubts that the RCAF could employ them effectively, while RCAF, for its part, opposed RAF taking over a job RCAF saw as its own. The commanding officer of 120 Squadron, 336:, head of Coastal Command, countered Bomber Command also risked having it fall in enemy hands, and having the Germans produce a countermeasure against it, before Coastal Command ever got to use it. In the event, this was exactly what happened. The first ASV.III was fitted to a Coastal Command Wellington at 264:. They limited the places U-boats could attack in safety, and (by reducing the ability of shadowing U-boats to find and track convoys) made shipping harder to find, thereby reducing losses. This also helped the convoy escorts, by enabling them to deal with one U-boat at a time. Despite a willingness of 304:
was developed. Though it had to overcome Air Ministry indifference, and only entered service in June 1941, it proved very successful. This, however, required a large aircraft, such as the Wellington or Liberator, to carry the generator needed to power the light, and most of Coastal Command's aircraft
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section, made several proposals, including diverting VLRs from Bomber Command to Coastal Command. "Despite the strength of Blackett's case, the Admiralty (not to mention the Air Ministry, Bomber Command, and the Americans) believed for some time yet that it could not afford to reduce the heavy air
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reduced the hazard of the Gap. After a crisis in March which nearly had Churchill and the Admiralty abandon convoys altogether, the Mid-Atlantic Gap was finally closed in May 1943, when RCAF VLRs became operational in Newfoundland, by which time the Battle of the Atlantic was largely won.
320:-frequency (10 cm) radar changed that, and the combination of H2S (as ASV.III) and Leigh light proved lethal to U-boats. Harris, however, denied Coastal Command any allocation of H2S systems, claiming Bomber Command needed it to find targets, in preference to 130:, commonly called the VLR Liberator or just VLR. The Liberator B.I proved too vulnerable for bombing missions over Europe, but had excellent range and payload, ideal for A/S patrol. Top priority for these was the U.S. Navy for reconnaissance operations in the 283:
A means of detecting surfaced submarines at night, when they were at their most vulnerable, recharging batteries, and felt most safe, was a top priority for Coastal Command. ASV gave it to them. The previous AI.II (Mark 2 Airborne Interception) radar became
257:, at a cost of 266 aircraft and crews. They accomplished no damage to the pens nor the submarines within them. Coastal Command strength never reached 266 VLRs. Missions flown against German U-boat building yards had similarly disappointing results. 300:(actually 1.7 m, 176 MHz), mid-VHF band emissions meant however, that a submarine was usually lost in sea return before it came in visual range, at around one mile (1.6 km), by which time it was already diving. In response, the 201:. "...he apparent inadequacy Newfoundland-based air support was highlighted by the early interception of SC 107 and the resultant bitter and costly battle." This led RAF to belatedly move a number of Coastal Command squadrons. 280:, the almost "perpetual fog of the Grand Banks also allowed pack operations to penetrate within a couple of hundred miles of Newfoundland, while aircraft patrolled harmlessly above", and made visual detection impossible. 80:(RAF)'s Coastal Command, when it was created in 1936, was given responsibility for antisubmarine warfare (A/S or ASW) patrol. It was equipped only with small numbers of short-ranged aircraft, the most common being the 448:
meant "a dramatic increase of USAAF Fortresses and medium-range Liberators" could be based in Newfoundland. 25h Wing flew over the Bay of Biscay, where they sank one U-boat before being redeployed to Morocco.
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by February 1943, while a copy of H2S was lost 2/3 February when a Stirling Pathfinder was shot down over the Netherlands, on only H2S's second operational use. Harris made similar objections to supplying the
356:
As Coastal Command predicted, the Germans captured the damaged H2S, which would have been next to impossible from a Coastal Command aircraft downed at sea, rather than over land, and Telefunken produced the
214:. As a measure of how valuable they were, after patrols off Canada were added in 1942, only one ship was lost in convoy. Even in mid-1942, Coastal Command only had two squadrons of Liberators and 25:
The Mid-Atlantic gap was an area outside the cover by land-based aircraft; those limits are shown with black arcs (map shows the gap in 1941). Blue dots show destroyed ships of the Allies
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routinely got higher priority for the best, longest-ranged aircraft. Only as Bomber Command transitioned to four-engined aircraft did Coastal Command receive the castoffs, such as
245:
Bomber Command did not refuse entirely to offer assistance against U-boats. From 14 January 1943 through May, they flew seven thousand sorties against the U-boat pens in
444:, USAAF, with its medium-range B-24s (equipped with H2S, probably built by Canadians), made it possible to free up Coastal Command VLRs without it. The growth in numbers of 353:
units to Coastal Command (which knew it as ASV.IV), again got higher priority, and again saw it fall into German hands, almost exactly a year later, in February 1944.
1249:"Bomber" Harris: The Story of Marshal of the Royal Air Force, Sir Arthur Harris, Bt, GCG, OBE, AFC, LLD, Air Officer Commanding-in-Chief, Bomber Command, 1942–1945 440:, RCAF, before 10 May), while 120 Squadron's strength doubled. This still only put all of thirty-eight VLRs over the Mid-Atlantic Gap. The arrival of 428:(USAAF), arranging a trade of B-24s for comparable types. This enabled Slessor to make a deal with him to "borrow" one squadron. After attacks on convoy 436:
Bulloch, confirmed RCAF's ability, and in early March 1943, the number in Newfoundland belatedly increased (though it was not enough to constitute
1266: 1074: 134:, where their long range were equally valuable, but where they generally carried out missions of lower priority than Coastal Command's. 204:
The nine Liberator GR.Is operating over the Atlantic, members of 120 Squadron based in Iceland, were nevertheless a worry to Admiral
1200: 193:, VLRs guided by HF/DF drove off three shadowing U-boats in one day, 16 October. They bettered the performance on 29 October, for 230: 186: 900: 1294: 1289: 219: 911: 382:
designation. While fragile, Naxos worked. However, it entered service the same day as the 10 GHz-emissions H2X (which
288:(Air to Surface Vessel Mark 2) fitted in Coastal Command aircraft. Coastal Command priority for it, however, ranked behind 425: 414: 1157: 341: 277: 101: 305:
were incapable of it, nor were Bomber Command inclined to turn over anything better. Moreover, the Germans developed
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Coastal Command would never have attempted, U-boats could trail convoys beginning very soon after departure from
403: 346: 265: 210: 127: 471: 441: 309:, which picked up ASV's radar pulses before it was able to detect a submarine at all, rendering it useless. 261: 100:, which finally had adequate range for A/S patrol. Moreover, Coastal Command's motley assortment of Ansons, 89: 466: 180: 162: 45: 34: 1181: 124: 21: 437: 373: 366: 273: 215: 168: 151: 105: 1116: 1018: 297: 289: 238: 176: 172: 42: 88:(which was obsolete); for a time, shortages of aircraft were so severe, "scarecrow patrols" using 1216: 97: 93: 85: 527:(London: BBC, 1978), p. 204. The United States would use a similar expedient in early 1942. 1262: 1196: 1130: 1070: 329: 325: 234: 491: 321: 285: 113: 1122:. Philadelphia: Institute of Physics Publishers, 1998. (Reprints A. Hilger 1987 edition). 915: 433: 185:
on 12 October 1942. Even then, VLRs proved invaluable in co-operation with shipborne
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The Challenge of War: Britain's scientific and engineering contributions to World War Two
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Gap, or just "the Gap". The gap was eventually closed in May 1943, as growing numbers of
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is a geographical term applied to an undefended area of the Atlantic Ocean during the
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Aircraft versus submarine: the evolution of the anti-submarine aircraft, 1912 to 1972
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Aircraft also had an important indirect role, by preventing even the formation of
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to create a submersible version for U-boat defense, of the aviation-utilized
350: 317: 313: 57: 175:, only to meet aircraft, and Coastal Command sank two, while in protecting 1228:
North Atlantic run: the Royal Canadian Navy and the battle for the convoys
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North Atlantic Run: the Royal Canadian Navy and the battle for the convoys
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Freedom's Forge: How American Business Produced Victory in World War II,
559:(Annapolis, MD: United States Naval Institute Press, 2003), p. 70. 897: 372:
radar detector for night fighters, the submersible version getting the
246: 1188:. London: Coronet Books, 1979 (reprints 1978 Hamish Hamilton edition). 1152:
Electronic warfare: Element of Strategy and Multiplier of Combat Power
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Electronic Warfare: Element of Strategy and Multiplier of Combat Power
218:, and at the first sign of Coastal Command's success against U-boats, 159: 49: 608:(Annapolis: United States Naval Institute Press, 1985), p. 158. 48:(A/S) aircraft. This resulted in heavy merchant shipping losses to 306: 167:
on 11 September 1942, there was exactly one VLR of the RAF's
20: 1274:
The Atlantic Campaign : World War II's great struggle at sea
1017:, p. 143. The same sort of condescension was applied to the 268:(RCAF) aircraft to fly in (perennially bad) conditions off the 222:
sought to have their aircraft used in attacking German cities.
328:, while arguing Coastal Command might lose it to the Germans. 84:(which was obsolete by the start of the Second World War) and 1230:. Annapolis, MD: United States Naval Institute Press, 1985. 1178:. Annapolis, MD: United States Naval Institute Press, 2003. 514:(Shepperton, Surrey, UK: Ian Allan Ltd., 1979), p. 157. 1164:. Toronto: Stoddart, 1990 (reprints 1947 Collins edition). 577:(St. Catharines, ON: Vanwell Publishing, 2003), p. 99. 1186:
Most Secret War: British Scientific Intelligence 1939–1945
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were unable to carry the standard 450-pound (200 kg)
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could not detect) became operational in Coastal Command.
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became available, and as basing problems were addressed.
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The Bombers: The RAF offensive against Germany 1939–1945
197:, driving off five, and seven on 6 November around 1211:
The War in the Air: The Royal Air Force in World War II
116:. (The other aircraft capable of carrying it, the 880: 878: 775:(London: Wordsworth, 1997 ed.), pp. 454–455. 137:VLRs were of particular importance in times when 1035: 1033: 1031: 824: 822: 820: 41:. The region was beyond the reach of land-based 1237:. St. Catherines, ON: Vanwell Publishing, 2003. 1069:pp. 243–244, Random House, New York, NY, 2012. 569: 567: 565: 1056:(Toronto: University of Toronto Press, 1989). 969: 967: 935: 933: 898:RAF History - Bomber Command 60th Anniversary 855: 853: 851: 849: 847: 8: 1251:. Garden City, N.Y. : Doubleday, 1985. 1223:. New York: William Morrow & Co., 1976. 1171:. New York: Taplinger Publishing Co., 1970. 551: 549: 547: 545: 543: 541: 539: 537: 535: 533: 16:Area outside airplane range in World War II 56:, as well as the Atlantic Gap, Air Gap, 503: 340:in December 1942, with twelve based at 171:overhead. Fifteen U-boats converged on 424:got control of A/S aircraft from the 398:in May 1944, and was supplemented by 120:, was Bomber Command's crown jewel.) 7: 1276:. New York: Harper & Row, 1988. 1160:., Marshal of the Royal Air Force. 1125:Costello, John, and Hughes, Terry. 952:. (New York: Pergamon Press, 1981) 14: 1154:. New York: Pergamon Press, 1981. 278:air-to-surface-vessel (ASV) radar 123:Coastal Command's prize was the 759:(London: Wordsworth, 1997 ed.). 349:-created 3 cm-wavelength 1: 909:Campaign Diary: February 1943 426:United States Army Air Forces 402:, what today would be called 112:; that needed Wellingtons or 64:(Very Long Range models) and 1261:. London: Wordsworth, 1997. 1195:. London: Hutchinson, 1983. 1054:Great Naval Battle of Ottawa 452:Increasing availability of 179:, 120 Squadron's VLRs sank 52:.It is frequently known as 1311: 1213:. New York: Morrow, 1968. 1176:The Battle of the Atlantic 1127:The Battle of the Atlantic 557:The Battle of the Atlantic 1147:. St Albans: Triad, 1978. 1129:. London: Collins, 1977. 905:UK Government Web Archive 1269:(reprints 1985 edition). 1244:. London, Kimber, 1973. 914:21 February 2006 at the 404:radar absorbent material 266:Royal Canadian Air Force 211:Befehlshaber der U-Boote 1182:Jones, R. V., Professor 918:. Accessed 18 July 2008 472:Mid-Ocean Meeting Point 442:25th Antisubmarine Wing 332:backed him up. Marshal 1295:Battle of the Atlantic 1290:Anti-submarine warfare 1235:Battle of the Atlantic 1041:Battle of the Atlantic 1015:Battle of the Atlantic 1002:Battle of the Atlantic 886:Battle of the Atlantic 870:Battle of the Atlantic 830:Battle of the Atlantic 786:Battle of the Atlantic 575:Battle of the Atlantic 512:Coastal Command at War 467:Mid-Ocean Escort Force 231:Patrick M. S. Blackett 35:Battle of the Atlantic 26: 1259:The Right of the Line 991:Ireland, p. 141. 982:Ireland, p. 140. 973:Johnson, p. 231. 961:Johnson, p. 229. 939:Ireland, p. 188. 927:Johnson, p. 230. 859:Johnson, p. 227. 841:Johnson, p. 207. 773:The Right of the Line 757:The Right of the Line 743:Johnson, p. 234. 595:Ireland, p. 124. 406:, under the codename 125:Consolidated Aircraft 24: 708:Milner, p. 224. 586:Ireland, p. 71. 158:was attacked by the 92:were even employed. 1240:Price, Alfred, Dr. 1217:Middlebrook, Martin 1019:Royal Canadian Navy 903:6 July 2007 at the 801:, pp. 140–141. 721:, pp. 224–225. 298:1½-metre wavelength 290:RAF Fighter Command 239:Operations Research 141:was unable to read 98:Vickers Wellingtons 43:RAF Coastal Command 1272:Van der Vat, Dan. 1191:Longmate, Norman. 1174:Ireland, Bernard. 1101:North Atlantic Run 1088:North Atlantic Run 1052:Zimmerman, David. 812:North Atlantic Run 799:North Atlantic Run 732:North Atlantic Run 719:North Atlantic Run 697:North Atlantic Run 684:North Atlantic Run 671:North Atlantic Run 658:North Atlantic Run 645:North Atlantic Run 632:North Atlantic Run 619:North Atlantic Run 555:Ireland, Bernard. 410:("Chimneysweep"). 312:The appearance of 233:, Director of the 94:RAF Bomber Command 86:Vickers Vildebeest 27: 1267:978-1-85326-683-6 1075:978-1-4000-6964-4 788:, pp. 98–99. 417: 330:Winston Churchill 1302: 1247:Saward, Dudley. 1162:Bomber Offensive 1158:Harris, Arthur T 1104: 1097: 1091: 1084: 1078: 1065:Herman, Arthur. 1063: 1057: 1050: 1044: 1037: 1026: 1011: 1005: 998: 992: 989: 983: 980: 974: 971: 962: 959: 953: 946: 940: 937: 928: 925: 919: 895: 889: 882: 873: 866: 860: 857: 842: 839: 833: 826: 815: 808: 802: 795: 789: 782: 776: 766: 760: 750: 744: 741: 735: 728: 722: 715: 709: 706: 700: 693: 687: 680: 674: 667: 661: 654: 648: 641: 635: 628: 622: 615: 609: 602: 596: 593: 587: 584: 578: 571: 560: 553: 528: 523:Johnson, Brian. 521: 515: 508: 492:Project Habakkuk 415: 413:Just before the 408:Schornsteinfeger 390:was replaced by 296:units. ASV.II's 39:Second World War 31:Mid-Atlantic gap 1310: 1309: 1305: 1304: 1303: 1301: 1300: 1299: 1280: 1279: 1150:Gordon, Don E. 1113: 1108: 1107: 1098: 1094: 1085: 1081: 1064: 1060: 1051: 1047: 1038: 1029: 1012: 1008: 999: 995: 990: 986: 981: 977: 972: 965: 960: 956: 948:Gordon, Don E. 947: 943: 938: 931: 926: 922: 916:Wayback Machine 896: 892: 883: 876: 867: 863: 858: 845: 840: 836: 827: 818: 809: 805: 796: 792: 783: 779: 767: 763: 751: 747: 742: 738: 729: 725: 716: 712: 707: 703: 694: 690: 681: 677: 668: 664: 655: 651: 642: 638: 629: 625: 616: 612: 603: 599: 594: 590: 585: 581: 572: 563: 554: 531: 522: 518: 509: 505: 500: 463: 454:escort carriers 446:escort carriers 434:Squadron Leader 363:Rotterdam Gerät 359:Rotterdam Gerät 78:Royal Air Force 74: 66:escort carriers 17: 12: 11: 5: 1308: 1306: 1298: 1297: 1292: 1282: 1281: 1278: 1277: 1270: 1255:Terraine, John 1252: 1245: 1238: 1233:Milner, Marc. 1231: 1226:Milner, Marc. 1224: 1214: 1204: 1189: 1179: 1172: 1167:Hartcup, Guy. 1165: 1155: 1148: 1138: 1123: 1112: 1109: 1106: 1105: 1103:, p. 239. 1092: 1079: 1058: 1045: 1043:, p. 148. 1027: 1006: 1004:, p. 143. 993: 984: 975: 963: 954: 941: 929: 920: 890: 888:, p. 144. 874: 861: 843: 834: 832:, p. 101. 816: 814:, p. 140. 803: 790: 777: 769:Terraine, John 761: 753:Terraine, John 745: 736: 734:, p. 225. 723: 710: 701: 699:, p. 158. 688: 686:, p. 188. 675: 673:, p. 180. 662: 660:, p. 176. 649: 647:, p. 173. 636: 634:, p. 171. 623: 621:, p. 161. 610: 604:Milner, Marc. 597: 588: 579: 573:Milner, Marc. 561: 529: 525:The Secret War 516: 510:Bowyer, Chaz. 502: 501: 499: 496: 495: 494: 489: 484: 479: 474: 469: 462: 459: 422:Ernest J. King 139:Bletchley Park 128:Liberator GR.I 118:Avro Lancaster 73: 70: 62:VLR Liberators 15: 13: 10: 9: 6: 4: 3: 2: 1307: 1296: 1293: 1291: 1288: 1287: 1285: 1275: 1271: 1268: 1264: 1260: 1256: 1253: 1250: 1246: 1243: 1239: 1236: 1232: 1229: 1225: 1222: 1218: 1215: 1212: 1208: 1205: 1202: 1201:0-09-151580-7 1198: 1194: 1190: 1187: 1183: 1180: 1177: 1173: 1170: 1166: 1163: 1159: 1156: 1153: 1149: 1146: 1142: 1141:Deighton, Len 1139: 1136: 1132: 1128: 1124: 1121: 1118: 1115: 1114: 1110: 1102: 1096: 1093: 1089: 1083: 1080: 1076: 1072: 1068: 1062: 1059: 1055: 1049: 1046: 1042: 1036: 1034: 1032: 1028: 1024: 1020: 1016: 1010: 1007: 1003: 997: 994: 988: 985: 979: 976: 970: 968: 964: 958: 955: 951: 945: 942: 936: 934: 930: 924: 921: 917: 913: 910: 906: 902: 899: 894: 891: 887: 881: 879: 875: 872:, p. 102 871: 865: 862: 856: 854: 852: 850: 848: 844: 838: 835: 831: 825: 823: 821: 817: 813: 807: 804: 800: 794: 791: 787: 781: 778: 774: 770: 765: 762: 758: 754: 749: 746: 740: 737: 733: 727: 724: 720: 714: 711: 705: 702: 698: 692: 689: 685: 679: 676: 672: 666: 663: 659: 653: 650: 646: 640: 637: 633: 627: 624: 620: 614: 611: 607: 601: 598: 592: 589: 583: 580: 576: 570: 568: 566: 562: 558: 552: 550: 548: 546: 544: 542: 540: 538: 536: 534: 530: 526: 520: 517: 513: 507: 504: 497: 493: 490: 488: 485: 483: 480: 478: 475: 473: 470: 468: 465: 464: 460: 458: 455: 450: 447: 443: 439: 435: 431: 427: 423: 419: 411: 409: 405: 401: 397: 393: 389: 385: 381: 380: 376: 371: 370: 364: 360: 354: 352: 348: 343: 339: 335: 331: 327: 323: 319: 315: 310: 308: 303: 299: 295: 294:night fighter 291: 287: 281: 279: 275: 271: 267: 263: 258: 256: 252: 248: 243: 240: 236: 232: 228: 227:Convoy SC 118 223: 221: 217: 213: 212: 207: 202: 200: 199:Convoy SC 107 196: 195:Convoy HX 212 192: 191:Convoy SC 104 188: 184: 183: 178: 177:Convoy ON 136 174: 173:Convoy ON 131 170: 166: 165: 161: 157: 156:Convoy ON 127 153: 149: 146: 145: 140: 135: 133: 129: 126: 121: 119: 115: 111: 107: 103: 99: 95: 91: 87: 83: 79: 71: 69: 67: 63: 59: 55: 54:The Black Pit 51: 47: 46:antisubmarine 44: 40: 36: 32: 23: 19: 1273: 1258: 1248: 1241: 1234: 1227: 1220: 1210: 1207:Lyall, Gavin 1192: 1185: 1175: 1168: 1161: 1151: 1144: 1126: 1119: 1117:Bowen, E. 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Without 262:wolf packs 216:Fortresses 208:, who was 82:Avro Anson 1135:464381083 351:H2X radar 318:gigahertz 235:Admiralty 58:Greenland 1099:Milner, 1086:Milner, 1039:Milner, 1013:Milner, 1000:Milner, 912:Archived 901:Archived 884:Milner, 868:Milner, 828:Milner, 810:Milner, 797:Milner, 784:Milner, 730:Milner, 717:Milner, 695:Milner, 682:Milner, 669:Milner, 656:Milner, 643:Milner, 630:Milner, 617:Milner, 487:MAC ship 482:CAM ship 477:GIUK gap 461:See also 367:FuG 350 347:American 342:Chivenor 154:). When 106:Hampdens 102:Whitleys 1021:by the 430:ONS 166 416:TRIDENT 379:Naxos U 338:Defford 274:Halifax 247:Lorient 132:Pacific 72:History 50:U-boats 37:in the 1265:  1221:Convoy 1199:  1145:Bomber 1133:  1073:  400:Stumpf 316:three 286:ASV.II 253:, and 225:After 220:Harris 160:U-boat 148:Enigma 104:, and 498:Notes 396:Tunis 388:Naxos 384:Naxos 369:Naxos 307:Metox 251:Brest 182:U-597 164:U-584 152:Ultra 1263:ISBN 1197:ISBN 1131:OCLC 1071:ISBN 392:FuMB 375:FuMB 326:Oboe 324:and 76:The 29:The 907:, 394:36 322:Gee 314:H2S 292:'s 237:'s 1286:: 1257:. 1219:. 1209:. 1184:. 1143:. 1030:^ 966:^ 932:^ 877:^ 846:^ 819:^ 771:. 755:. 564:^ 532:^ 377:7 249:, 1203:. 1137:. 1090:. 1077:. 1025:. 150:(

Index


Battle of the Atlantic
Second World War
RAF Coastal Command
antisubmarine
U-boats
Greenland
VLR Liberators
escort carriers
Royal Air Force
Avro Anson
Vickers Vildebeest
Tiger Moths
RAF Bomber Command
Vickers Wellingtons
Whitleys
Hampdens
depth charge
Sunderlands
Avro Lancaster
Consolidated Aircraft
Liberator GR.I
Pacific
Bletchley Park
Kriegsmarine
Enigma
Ultra
Convoy ON 127
U-boat
U-584

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