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Operationsbefehl Hartmut

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offloading troops and war materials. Prien targeted two cruisers and two transports with the four forward torpedoes but none detonated. An hour and a half later after a thorough inspection of the tubes and torpedoes, Prien tried again. Again, with a textbook surfaced attack from 750m away using four
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Operation Hartmut engaged nearly every submarine in Germany's navy - most notably, both older Type IA submarines and all six of Germany's IIA coastal submarines, which were operating as training boats in the Baltic. Boats which were initially unavailable for action at the beginning of the operation
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These U-boats began patrols during the timeframe of Operation Weserübung, but were not fit for service (either due to damage, command changes or other reasons) during the beginning of Hartmut. These submarines generally operated in the area of the Orkney islands, Shetland Islands, and near Bergen.
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Other speculation has pointed to the unfamiliar conditions of the campaign for the abnormally large number of torpedo failures. Most commanders were used to operating at sea where the effect of tides and currents over short distances is negligible between a boat and its target. Underwater movement
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Dönitz predicted spectacular results for his submarines. In his memoirs he wrote, "Undoubtedly the enemy would react sharply to the landing of German troops in Norway. Their operations could be directed at our occupied ports or their own facilities - that is, strategically important sites for the
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Despite orders to cease using magnetic pistols in late 1939, Dönitz had authorized commanders to use either magnetic or impact pistols on their torpedoes during Operation Weserübung. Cold water in the North Sea and Norwegian fjords hampered the use of electric torpedoes used at the time, which
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English... The enemy was also bound to the narrow waterways of the fjords; their ships would have to pass near the U-boats. They could only go unseen in very turbulent weather. The deployment of multiple U-boats in staggered formation would likely yield more shooting opportunities."
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U-boats succeeded in reporting some Allied fleet movements, but Dönitz' greatest interest was sinking ships - a portion of Hartmut where the U-boats performed underwhelmingly. In general, submarine attacks in the Norwegian waters proved ineffective. Nearly two-thirds of the
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At this point, commanders and crews were simply ordered into the North Sea. A sealed envelope aboard each of the U-boats held their official orders. The envelope was to be opened upon receiving the radio code word "Hartmut" (hence the attributed name Operation Hartmut).
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By the beginning of April 1940, 31 U-boats were ready for operations between England and Norway. On 6 April, the codeword "Hartmut" was transmitted and German submarines began their designated operations.
143:' generally slow surface speed compared to surface vessels, many of the U-boats specifically assigned to perform in Operation Weserübung departed before the main surface fleet left from the mouth of the 125:
First hints of an impending invasion of Norway and Denmark came in March 1940. By early April, most of the U-boats to be used for Operation Hartmut as part of Operation Weserübung were ready.
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may have significantly affected torpedoes, by throwing them off course or making them run too deep - potentially explaining at least part of the missed shots and torpedo failures.
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less effective. Coastal operations may have also hampered commanders used to the open sea. Speculation persists that massive torpedo failure during this campaign provoked German
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attacked a group of British destroyers, but the torpedoes missed or failed to arm. The U-boat subsequently suffered moderate damage when the same destroyers depth charged her.
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When Hartmut was issued on 6 April 1940 the German plan designated the U-bootwaffe into eight groups (along with a further Group Seven, which was cancelled).
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German submarines operating near the Norwegian coast made numerous attacks on British ships, although many proved unsuccessful due to faulty torpedoes.
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U-boats were called up, despite that the Norwegian coast limited their operating time. The operation subsequently disrupted training exercises in the
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The operation's reconnaissance and screening objectives succeeded for the most part, however Hartmut is notable for the large number of faulty
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made multiple attacks on a fleet of three cruisers on 10 April, but the torpedoes failed to arm or detonated prematurely. Later on 14 April,
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sank one Swedish tanker, one Norwegian freighter and one British freighter equalling 18,715 tons of shipping between 10 and 12 April.
1027:- a Type IIA brought to frontline status for two patrols during the operation before returning to her role as a training boat. 533:
Four submarines were also lost - three ocean-going submarines consisting of two VIIBs and one IXB along with one older IIA.
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delivered supplies to German troops in Trondheim, before going on patrol and sinking one British supply ship on 21 April.
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Further U-boat sailings are to be stopped. U-boats which have already sailed are not to operate off the Norwegian coast.
1069:- a Type IIB, which was on patrol west of the Norwegian Coast when Dönitz first received orders to prepare for Hartmut. 1684: 1462: 1375: 1261: 1235: 649:
sank the boat on 13 April. Schulz and other surviving crew were rescued from the water by German troops in Norway.
1191:- a Type IXA, which also delivered supplies to Trondheim. On her return journey she was bombed by two British 483: 85:. The deployment of U-boats during Operation Weserübung is occasionally criticized as a waste of manpower and 1186: 1178: 1170: 1154: 1135: 1127: 1115: 1103: 1084: 1076: 988: 976: 960: 940: 922: 889: 869: 853: 837: 820: 766: 758: 750: 738: 693: 674: 652: 617: 605: 581: 557: 473: 435: 369: 329: 323: 303: 257: 132:
intermittently sent ships to reconnoitre areas of the Norwegian coast and to try to locate portions of the
1175:- a Type VIIA also tasked with delivering supplies to Trondheim, but with an uneventful subsequent patrol. 1064: 1046: 1038: 1030: 1022: 792: 784: 718: 690:, the first ship sunk during the war. His patrol along the coast of Norway during Hartmut was uneventful. 498: 232: 798: 797:- a Type IIA brought into frontline status before returning to her role as a training boat. Sank the 658: 587: 238: 23: 166:
All Naval forces to be ready for operations as quickly as possible. No special degree of readiness.
724: 623: 191: 126: 1783: 1287: 789:- a Type IIA brought into frontline service. The submarine was sunk by mines, probably on 6 April. 949:. She sank two ships and damaged another during the operational time period. During this patrol, 825:- a Type IXA, one of the few boats to survive to be scuttled near the war's end. During Hartmut, 563: 187: 98: 1205: 155:
Preparations in the German submarine forces (U-bootwaffe) began in early March. On 4 March 1940
31: 1215: 78: 63: 1388: 523: 286: 1081:- a Type IIB that sank a Norwegian vessel in February, but nothing on patrol during Hartmut. 627: 346: 289:. The first torpedo failed to arm, but the second broke the ship in half. A few days later 1457:
Trompelt, Heinz (2006). Eine andere Sicht. Norderstedt: Books on Demand GmbH, pg 137-140.
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engaged multiple ships, but was plagued with premature torpedo detonations and misses.
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attacked a destroyer, but the torpedoes detonated prematurely. On 19 April, commander
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Blair, Clay (1996). Hitler's U-Boat War. London: Weidenfeld & Nicolson, pg 155.
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aircraft on 22 April, suffering light damage on the return journey to Wilhelmshaven.
571: 110: 50:. The orders involved submarine screening actions for the German invasion fleet and 1828: 1329: 1315: 982: 913: 875: 639: 441: 106: 1343: 1141: 1006:
Never assembled. Group Seven was designated to patrol the Eastern entrance to the
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had no success. One detonated underwater after hitting a rock, well off course.
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were positioned at the entrance of the fjord. When the Royal Navy arrived,
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sank a British tanker in late March, but had no success during Weserübung.
1788: 966: 661:, which patrolled in the North Sea for 36 days without sinking any ships. 379: 282: 144: 94: 518:
failed by either detonating too early, not arming, or running too deep.
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on the morning of 7 April. Twenty U-boats went out on 3, 4 and 5 April.
927:- a Type VIIB was sunk by mines on 6 April en route to her patrol area. 595: 195: 133: 634:
was the first U-boat sunk by aircraft in the war. While anchored near
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had a relatively successful career, she sank no ships during Hartmut.
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Naval battles and operations of the European theatre of World War II
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fired and four U-boats sunk. These problems came at a time when the
1159:- a Type IA - one of only two in the Kriegsmarine (the other being 1035:- a Type IIA also brought into frontline service for the operation. 985:
had one long patrol during the entire operation, but no ships sunk.
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as six outdated Type IIA training submarines were brought into the
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Patrol Area: Bergen, Shetland Islands; SW of the Norwegian Coast.
1724: 1656: 1642: 1628: 1614: 1572: 1488: 1132:- a Type IIB that began operations in late April without success. 827: 383: 179: 114: 74: 39: 1710: 1544: 1530: 1301: 1183:- a Type VIIA that delivered supplies to Trondheim in early May. 1124:'s former Type IIB. The submarine had no success during Hartmut. 1089:- a Type IIB that sank four Danish merchants on 19 and 20 March. 816:
Patrol Area: East of the Shetland Islands, Vagsfjord, Trondheim
698:- a Type VIIA, which torpedoed the scuttled Norwegian minelayer 101:
into improving the weapon's performance. U-boat commanders like
954: 391: 270: 67: 55: 43: 27: 1389:"Priens erfolgloser Angriff auf die britische Landungsflotte" 1051:- a Type IIA brought into frontline service for one patrol. 1043:- a Type IIA brought into frontline service for one patrol. 1144:
went on patrol in mid-April, but did not have any success.
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Patrol Area: Pentland, Orkney islands, Shetland Islands
1767:"Patrol of U-Boat U-43 from 12 Apr 1940 to 23 Apr 1940" 1559:"Patrol of U-Boat U-37 from 30 Mar 1940 to 18 Apr 1940" 1431:"Patrol of U-Boat U-51 from 11 Mar 1940 to 22 Apr 1940" 1358:"Patrol of U-Boat U-37 from 30 Mar 1940 to 18 Apr 1940" 542:
took part in ferrying supplies or patrolling later on.
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damaged another British ship before returning to port.
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off the Shetland islands with one torpedo on 17 April.
1601:"Patrol of U-Boat U-48 from 3 Apr 1940 to 20 Apr 1940" 1587:"Patrol of U-Boat U-47 from 3 Apr 1940 to 26 Apr 1940" 1517:"Patrol of U-Boat U-34 from 3 Apr 1940 to 30 Apr 1940" 1503:"Patrol of U-Boat U-65 from 9 Apr 1940 to 14 May 1940" 1445:"Patrol of U-Boat U-65 from 9 Apr 1940 to 14 May 1940" 1417:"Patrol of U-Boat U-48 from 3 Apr 1940 to 20 Apr 1940" 1403:"Patrol of U-Boat U-47 from 3 Apr 1940 to 26 Apr 1940" 1344:"Patrol of U-Boat U-13 from 21 Apr 1940 to 2 May 1940" 1108:- a Type IIB for frontline training; until late April 378:
encountered "a wall of ships" on 15 April. A British
62:. The orders also resulted in a number of attacks on 747:, but which failed to sink any ships during Hartmut. 553:Patrol Area: Narvik, Harstad, Westfjord, Vagsfjord 352:missing both. In the second battle, U-38 fired at 186:were fit for the operation. One older ocean-going 113:had the only patrols of their careers without any 1795: 1685:"Appendix 1 to B.d.U's War Log, 1–31 March 1940" 1073:conducted three patrols during March/April 1940. 714:Patrol Area: Bergen, Aalesund, Shetland Islands 614:, who failed to sink any vessels during Hartmut. 421:spent the next hours submerged under persistent 1809:Naval battles of World War II involving Germany 1671:"Patrol of U-59 from 31 Mar 1940 to 7 May 1940" 1814:Naval battles of World War II involving Norway 1804:Naval battles of World War II involving France 1288:"Die U-Boote bei dem "Unternehmen Weserübung"" 670:Patrol Area: Trondheim, Namsos, Romsdalsfjord 159:received orders from his superiors in Berlin: 22:(literally "Operation Order Hartmut") was the 997:, which sank one Norwegian vessel on 6 April. 536: 463:was depth charged, but escaped destruction. 217: 93:and operations in cold weather rendered the 459:s destroyer screen fired on the vessel and 174:any vessel that could dive. Only 12 larger 81:was still going exceptionally well against 46:. Occasionally these operations are termed 16:Code word to begin German submarine in WWII 1236:"F.d.U./B.d.U.'S War Log, 1–15 April 1940" 1148: 359:but the torpedoes detonated prematurely. 882:- both who ended the war as successful 771:- a Type IIC with an uneventful patrol. 763:- a Type IIC with an uneventful patrol. 755:- a Type IIC with an uneventful patrol. 743:- a Type IIB successfully commanded by 452:but both torpedoes failed to detonate. 182:submarines capable of operating in the 150: 1796: 683:, who was responsible for sinking the 508: 120: 1013: 1001: 709: 1055: 886:, but had no success on this patrol. 811: 775: 322:on 10 April 1940 and 13 April 1940. 1784:U-Boats during Operation Weserübung 1475:"War Patrols by German U-Boat U-51" 957:for a short time on 19 to 21 April. 931: 665: 548: 522:required heating to reach suitable 13: 1140:- a Type IIC under the command of 1018:Patrol Area: Lindesnes, Egernsund 14: 1840: 1777: 285:by the British after the German 262:sank the British steam merchant 1759: 1745: 1731: 1717: 1703: 1677: 1663: 1649: 1635: 1621: 1607: 1593: 1579: 1565: 1551: 1537: 1523: 1509: 1495: 1481: 1467: 1451: 1437: 1423: 1409: 1395: 1381: 919:with one dead and 41 survivors. 190:was also included. 12 smaller 1364: 1350: 1336: 1322: 1308: 1294: 1280: 1254: 1228: 602:had no success during Hartmut. 578:had no success during Hartmut. 66:- particularly in or near the 1: 1221: 1093: 638:, British forces including a 488:, but both torpedoes missed. 953:docked in recently occupied 482:attacked the French cruiser 277:then sank the Danish vessel 89:for this reason. The use of 7: 1199: 499:Hans-Gerrit von Stockhausen 10: 1845: 1789:U-boat Archive - BDU's KTB 993:- a Type IIC commanded by 945:- a Type IIB commanded by 1629:"The Type VIIB boat U-50" 1615:"The Type VIIB boat U-49" 799:British T-class submarine 537:Submarine order of battle 281:that had been taken as a 239:British T-class submarine 218:Attacks on Allied vessels 1489:"The Type IXB boat U-64" 898:was sunk on 15 April by 70:of the Norwegian coast. 20:Operationsbefehl Hartmut 1573:"The Type IX boat U-38" 1149:Other submarine actions 780:Patrol Area: Stavanger 570:. Under the command of 491: 466: 428: 362: 311: 296: 250: 1216:Battle of the Atlantic 1112:was not on war patrol. 834:sank three freighters. 225: 1010:, but was cancelled. 524:operating temperature 410:spotted and attacked 318:There were two naval 287:occupation of Denmark 1206:Operation Weserübung 894:- a Type VIIB under 874:- a Type VIIB under 858:- a Type VIIB under 679:- a Type VIIA under 628:Georg-Wilhelm Schulz 610:- a Type VIIB under 151:Hartmut preparations 32:Operation Weserübung 981:- a Type IIC under 965:- a Type IIC under 842:- a Type IXA under 509:Operational results 390:were anchored near 121:Hartmut's execution 79:war in the Atlantic 54:- particularly off 1014:U-Boat Group Eight 1002:U-Boat Group Seven 947:Max-Martin Schulte 710:U-Boat Group Three 566:submarines in the 562:- one of only two 273:for a short time, 99:naval high command 30:operations during 1753:"Patrols of U-23" 1739:"Patrols of U-17" 1691:on 20 August 2013 1268:on 20 August 2013 1242:on 19 August 2013 1211:Battles of Narvik 1163:from Group One). 1056:U-Boat Group Nine 902:from the British 864:Hans-Werner Kraus 812:U-Boat Group Five 776:U-Boat Group Four 745:Herbert Wohlfarth 681:Fritz-Julius Lemp 320:battles of Narvik 269:After docking in 48:Operation Hartmut 1836: 1771: 1770: 1763: 1757: 1756: 1749: 1743: 1742: 1735: 1729: 1728: 1721: 1715: 1714: 1707: 1701: 1700: 1698: 1696: 1687:. Archived from 1681: 1675: 1674: 1667: 1661: 1660: 1653: 1647: 1646: 1639: 1633: 1632: 1625: 1619: 1618: 1611: 1605: 1604: 1597: 1591: 1590: 1583: 1577: 1576: 1569: 1563: 1562: 1555: 1549: 1548: 1541: 1535: 1534: 1527: 1521: 1520: 1513: 1507: 1506: 1499: 1493: 1492: 1485: 1479: 1478: 1471: 1465: 1455: 1449: 1448: 1441: 1435: 1434: 1427: 1421: 1420: 1413: 1407: 1406: 1399: 1393: 1392: 1385: 1379: 1368: 1362: 1361: 1354: 1348: 1347: 1340: 1334: 1333: 1326: 1320: 1319: 1312: 1306: 1305: 1298: 1292: 1291: 1284: 1278: 1277: 1275: 1273: 1264:. Archived from 1258: 1252: 1251: 1249: 1247: 1238:. Archived from 1232: 983:Herbert Kuppisch 932:U-Boat Group Six 896:Kurt von Gossler 876:Herbert Schultze 666:U-Boat Group Two 640:Fairey Swordfish 549:U-Boat Group One 516:magnetic pistols 458: 442:Herbert Schultze 91:magnetic pistols 26:to begin German 1844: 1843: 1839: 1838: 1837: 1835: 1834: 1833: 1794: 1793: 1780: 1775: 1774: 1765: 1764: 1760: 1751: 1750: 1746: 1737: 1736: 1732: 1725:"Type IIB U-19" 1723: 1722: 1718: 1709: 1708: 1704: 1694: 1692: 1683: 1682: 1678: 1669: 1668: 1664: 1657:"Type IIC U-57" 1655: 1654: 1650: 1643:"Type IIB U-13" 1641: 1640: 1636: 1627: 1626: 1622: 1613: 1612: 1608: 1599: 1598: 1594: 1585: 1584: 1580: 1571: 1570: 1566: 1557: 1556: 1552: 1543: 1542: 1538: 1529: 1528: 1524: 1515: 1514: 1510: 1501: 1500: 1496: 1487: 1486: 1482: 1473: 1472: 1468: 1456: 1452: 1443: 1442: 1438: 1429: 1428: 1424: 1415: 1414: 1410: 1401: 1400: 1396: 1387: 1386: 1382: 1369: 1365: 1356: 1355: 1351: 1342: 1341: 1337: 1328: 1327: 1323: 1314: 1313: 1309: 1300: 1299: 1295: 1286: 1285: 1281: 1271: 1269: 1260: 1259: 1255: 1245: 1243: 1234: 1233: 1229: 1224: 1202: 1151: 1122:Otto Kretschmer 1096: 1058: 1016: 1008:English Channel 1004: 934: 880:Reinhard Suhren 832:Werner Hartmann 814: 778: 712: 668: 551: 539: 511: 496: 471: 456: 433: 388:transport ships 367: 316: 301: 255: 230: 220: 153: 123: 38:'s invasion of 17: 12: 11: 5: 1842: 1832: 1831: 1826: 1821: 1816: 1811: 1806: 1792: 1791: 1786: 1779: 1778:External links 1776: 1773: 1772: 1758: 1744: 1730: 1716: 1711:"Type IIB U-7" 1702: 1676: 1662: 1648: 1634: 1620: 1606: 1592: 1578: 1564: 1550: 1545:"Type IIA U-4" 1536: 1531:"Type IIA U-1" 1522: 1508: 1494: 1480: 1466: 1450: 1436: 1422: 1408: 1394: 1380: 1363: 1349: 1335: 1321: 1307: 1302:"Type IIA U-4" 1293: 1279: 1253: 1226: 1225: 1223: 1220: 1219: 1218: 1213: 1208: 1201: 1198: 1197: 1196: 1184: 1176: 1168: 1150: 1147: 1146: 1145: 1133: 1125: 1113: 1095: 1092: 1091: 1090: 1082: 1074: 1057: 1054: 1053: 1052: 1044: 1036: 1028: 1015: 1012: 1003: 1000: 999: 998: 986: 974: 958: 933: 930: 929: 928: 920: 887: 867: 851: 844:Heinrich Liebe 835: 813: 810: 809: 808: 790: 777: 774: 773: 772: 764: 756: 748: 736: 711: 708: 707: 706: 691: 667: 664: 663: 662: 650: 642:launched from 615: 612:Dietrich Knorr 603: 592:Herbert Sohler 579: 572:Viktor Schütze 550: 547: 538: 535: 510: 507: 495: 490: 480:Dietrich Knorr 470: 465: 432: 427: 402:After leaving 366: 361: 315: 310: 300: 295: 254: 249: 229: 224: 219: 216: 184:Atlantic Ocean 168: 167: 164: 152: 149: 122: 119: 52:reconnaissance 15: 9: 6: 4: 3: 2: 1841: 1830: 1827: 1825: 1822: 1820: 1817: 1815: 1812: 1810: 1807: 1805: 1802: 1801: 1799: 1790: 1787: 1785: 1782: 1781: 1768: 1762: 1754: 1748: 1740: 1734: 1726: 1720: 1712: 1706: 1690: 1686: 1680: 1672: 1666: 1658: 1652: 1644: 1638: 1630: 1624: 1616: 1610: 1602: 1596: 1588: 1582: 1574: 1568: 1560: 1554: 1546: 1540: 1532: 1526: 1518: 1512: 1504: 1498: 1490: 1484: 1476: 1470: 1464: 1463:3-8334-4481-9 1460: 1454: 1446: 1440: 1432: 1426: 1418: 1412: 1404: 1398: 1390: 1384: 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749: 746: 742: 741: 737: 734: 730: 729:Wolfgang Lüth 727:commanded by 726: 722: 721: 717: 716: 715: 704: 703: 697: 696: 692: 689: 688: 682: 678: 677: 673: 672: 671: 660: 656: 655: 651: 648: 647: 641: 637: 633: 629: 625: 621: 620: 616: 613: 609: 608: 604: 601: 597: 593: 589: 585: 584: 580: 577: 573: 569: 565: 561: 560: 556: 555: 554: 546: 543: 534: 531: 527: 525: 519: 517: 506: 504: 500: 494: 489: 487: 486: 481: 477: 476: 469: 464: 462: 455: 451: 448:attacked HMS 447: 443: 439: 438: 431: 426: 424: 420: 416: 415: 409: 405: 400: 398: 393: 389: 385: 381: 377: 376:Günther Prien 373: 372: 365: 360: 358: 357: 351: 350: 344: 343: 337: 333: 332: 327: 326: 321: 314: 309: 307: 306: 299: 294: 292: 288: 284: 280: 276: 272: 267: 265: 261: 260: 253: 248: 246: 245: 240: 236: 235: 228: 223: 215: 211: 207: 203: 201: 197: 193: 189: 185: 181: 177: 173: 165: 162: 161: 160: 158: 148: 146: 142: 137: 135: 134:British fleet 131: 128: 118: 116: 112: 108: 104: 100: 96: 92: 88: 84: 80: 76: 71: 69: 65: 64:Allied 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Index

code word
submarine
Operation Weserübung
Nazi Germany
Denmark
Norway
reconnaissance
Narvik
Trondheim
Allied forces
fjords
torpedoes
war in the Atlantic
Britain
materiel
magnetic pistols
G7e torpedo
naval high command
Prien
Schultze
Schütze
tonnage
BdU
Karl Dönitz
British fleet
submarines
Weser river
Karl Dönitz
mobilized
Type VII

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