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Mediterranean U-boat campaign of World War I

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966: 222: 265: 144: 237: 194: 879:. This too was ineffective; the straits were too wide and deep for such a barrage to be successful, and consumed a huge effort and tied up many of the patrol vessels the Allies possessed. It also acted as a target for surface attacks, being the aim of a number of raids by KuK forces. Just two U-boats were caught in the barrage in all the time it was in operation; meanwhile the merchant ships continued to suffer huge losses. In 1916, the Allies lost 415 ships, of 1,045,058 long tons (1,061,828 t), ½ of all allied ships sunk in all theatres. 251: 208: 906:. Haus and the German delegates finally won the debate, partly by listing several instances where Allied submarines had sunk unarmed Austro-Hungarian ships in the Adriatic. The negotiations over the terms of the new Mediterranean submarine campaign were aided by the fact that Italy had declared war on Germany on 28 August 1916, making it no longer necessary for German U-boats to masquerade as Austrian vessels when attacking Italian shipping. 279: 22: 965: 780:
home waters, but it seemed justified by the successes in the Mediterranean in November, when 44 ships were sunk, for a total of 155,882 long tons (158,383 t). The total in December fell to 17 ships (73,741 long tons (74,924 t)) which was still over ½ the total tonnage sunk in all theatres of operation at the time.
768:—sailed for Cattaro. Since Germany was not yet at war with Italy, even though Austria was, the German submarines were ordered to refrain from attacking Italian shipping in the eastern Mediterranean where the Italians might expect hostile action only from German submarines. When operating in the west, up to the line of 983:
Throughout the year U-boats were still able to find and sink ships sailing independently. By 1918, however, the U-boats' successes began to drop. In January 1918, German U-boats sank 103,738 long tons (105,403 t) and the Austrians sank a further 20,020 long tons (20,340 t) while two Pola boats were sunk.
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By October 1918, the end of the campaign, Allied losses for the year stood at 761,000 long tons (773,000 t). The Pola Flotilla had lost 11 boats, and the KuK a further 3. In October, the Central Powers were on the verge of collapse; Bulgaria and the Ottomans had sued for peace, and the Austrians
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Shipping losses to U-boats reached a peak in April 1917, when the Central Powers had 28 boats operating, with as many as 10 at sea at any one time. While not a single submarine was sunk, they caused 94 ship losses in that one month, and severely endangered and delayed shipping. However, by that time,
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submarines would be ideal for Mediterranean service. Since these were too large to be shipped in sections by rail to Pola like the Type UB I, the materials for their construction and German workers to assemble them were sent instead. This meant a shortage of workers to complete U-boats for service in
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Beginning in April 1917, Japan, an ally of Great Britain, sent a total of 14 destroyers to the Mediterranean with cruiser flagships which were based at Malta and played an important part in escorting convoys to guard them against enemy submarines. The Japanese ships were very effective in patrol and
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on 25 and 27 May respectively on her way to Constantinople, but ran into severe limitations in the Dardanelles, where swarms of small craft and extensive anti-submarine netting and booms restricted their movements. In addition, the Germans dispatched a number of UB and UC type boats; these were sent
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During 1916, the commerce war continued unabated. Allied countermeasures were largely ineffective; the complex arrangements for co-operation between the various navies meant a fragmented and unco-ordinated response, while the main remedy favoured by the Allies for the U-boat menace was to establish
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The initial phase of the U-boat campaign in the Mediterranean comprised the actions by the KuK's U-boat force against the French. At the start of hostilities, the KuK had seven U-boats in commission; five operational, and two training; all were of the coastal type, with limited range and endurance,
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in May 1917, the Allies were unable to introduce a comprehensive system until later in the year. The number of routes, and divided responsibilities, made this complicated, while a continued belief in offensive measures, such as the Otranto Barrage, kept up a shortage of escort ships elsewhere.
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s war on Allied commerce; a significant proportion of British imports passed through it, it was critical to French and Italian trade, and submarines would be able to operate effectively in it even in the northern-hemisphere autumn and winter, when poor weather hampered naval operations in the
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Allied losses continued to fall during the year, while U-boat losses mounted. In May 1918, Allied losses dropped below 100,000 long tons (100,000 t) and did not rise above this again, while the Pola Flotilla lost four boats, its worst month of the war.
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harbor. Italian divers inspected the wreck and established her identity. The knowledge that Germany—technically their ally—was assiduously mining their naval bases was a contributing factor in Italy's decision in May 1916 to declare war on Germany.
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minelaying submarines, which were ordered converted into transports to carry small quantities of critical supplies to Turkey. However, the UB submarines were hindered by their short operational range and the Dardanelles currents, and in July
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unter Kapitänleutnant Wolfgang Steinbauer (1888–1978) dringt am 29 April 1918 in den italienischen Hafen Carloforte ein und zerstört den britischen Dampfer KINGSTONIAN, zwei britische Bergungsdampfer und eine französische
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stationed at Cattaro, following pleas from the German military attaché in Constantinople, who reported that the Royal Navy's close naval support was inflicting heavy losses on Turkish forces at the Gallipoli beachheads.
314: 2496: 548:, Admiral Lapeyrere's flagship. She was saved from sinking, but was forced to retire with a damaged bow. This setback dissuaded the French capital ships from penetrating too far into the Adriatic. On 27 April 1915, 1001:
were about to do the same. The Germans elected to abandon the Mediterranean; nine U-boats sailed from their bases on the Adriatic to return to Germany and a further ten boats were scuttled. Two ships—
772:, the German U-boats flew the Austrian flag, and a sinking without warning policy was adopted, since large merchant ships could be attacked on the suspicion of being transports or auxiliary cruisers. 2501: 39: 307: 1046:
Most of the German (and all of the Austro-Hungarian) U-boats operated out of the Adriatic, with their main base at Cattaro. Another German U-boat base was located at Constantinople in the
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to New York City—was fully booked and over 200 people were killed, including nine Americans. Coming as it did six months after the sinking of the British liner
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led a delegation to Vienna to secure the collaboration of Austria-Hungary. Grand Admiral Haus wholly supported the proposal, but Foreign Minister
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At the same time, the Germans determined to establish a force in the Adriatic to open the commerce war against Allied trade in the Mediterranean.
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anti-submarine activity. However, of the nine Austro-Hungarian navy submarines lost to enemy action, five were sunk by Italian navy units (
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to raid with near impunity during the first years of the war, causing substantial shipping losses, until the introduction of the
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But the KuK boats were unable to offer any interference to allied traffic in the Mediterranean beyond the Straits of Otranto.
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Atlantic and the North Sea. Additionally, there were certain choke points through which shipping had to pass, such as the
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the Italian Navy had instituted convoy operations, with the British following on the Alexandria-Malta route in May 1917.
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In April 1915, the Imperial German Navy sent their first submarines to the Mediterranean in response to the Anglo-French
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was destroyed. The last action of the Mediterranean force came on 9 November 1918, just two days before the armistice:
2199: 1570: 776: 1605: 1009:—were torpedoed on the way, the last Allied ships to be sunk in the Mediterranean, and three U-boats were attacked. 2511: 1891: 645: 637: 32: 2231: 2192: 1954: 882:
Eight of the top twelve U-boat aces served in the Pola Flotilla, including the highest scoring commander of all,
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In January 1917, following the German decision to resume unrestricted submarine warfare, Foreign Secretary
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The German campaign in the Mediterranean is generally agreed to have properly begun in October 1915, when
359: 762:). It was decided the same month that further reinforcements were called for, and a further large U-boat— 522:
coast. The Entente powers moved swiftly to blockade the Adriatic, sending a fleet to take station at the
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added to a growing outrage in the U.S. over unrestricted submarine warfare, and U.S. Secretary of State
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In December 1915, Valentiner caused further outrage when he sank the passenger liner
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By the end of June 1915, the Germans had assembled a further three pre-fabricated
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The Mediterranean was an attractive theatre of operations for the German
519: 947:), while none were sunk by the Japanese navy, which lost one destroyer ( 805:—caused a diplomatic incident when she sank the Italian passenger liner 487:
system allowed the Allies to drastically cut their losses from 1917 on.
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Nevertheless, they had a number of successes. On 21 December 1914,
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an anti-submarine barrier across the Straits of Otranto, the
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Military operations of World War I involving Austria-Hungary
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was blown up by her own mines while laying a mine field off
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In a further incident in March 1916, the German minelayer
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The United States in the First World War: An Encyclopedia
504:'s decision to remain neutral, the naval strength of the 754:. That month, 18 ships were sunk, for a total of 63,848 978:
Although convoys had been introduced between Malta and
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Military operations of World War I involving Germany
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New York: Capricorn Books. p. 295. 611:where they were assembled for transit to 152:sinking near Gibraltar on 9 November 1918 106:Learn how and when to remove this message 1061: 530:suitable for operation in the Adriatic. 1497:Atlantic U-boat campaign of World War I 1227: 656:On 21 July, the ocean-going submarines 1233: 1231: 1502:Battle of the Atlantic (World War II) 1054:, France, to near Alexandria, Egypt. 500:At the outbreak of World War I, with 7: 1267:. Taylor & Francis. p. 54. 939:), one by Italian and French units ( 902:had misgivings, as did the emperor, 890:1917: Unrestricted submarine warfare 44:adding citations to reliable sources 508:was represented by the navy of the 1369:The German Submarine War 1914–1918 1013:was damaged and forced to run for 852:without warning, with 343 killed. 668:were detached from service in the 326:Mediterranean Operations 1914–1918 14: 1649:List of wolfpacks of World War II 1206:Adriatic Campaign of World War I 277: 263: 249: 235: 220: 206: 192: 142: 20: 31:needs additional citations for 2400:Unrestricted submarine warfare 1442:The U-Boat offensive 1914–1945 1410:A Naval History of World War I 1: 2507:U-boat Campaign (World War I) 1216:U-boat Campaign (World War I) 1042:Bases and areas of operations 617:Mediterranean U-Boat Division 572:Operations at the Dardanelles 457:Mediterranean U-boat Campaign 125:Mediterranean U-boat Campaign 1512:Mediterranean (World War II) 1393:. Periscope Publishing Ltd. 1371:. Periscope Publishing Ltd. 943:), one by Royal Navy units ( 870:1916: Commerce war continues 475:) against the Allies during 1507:Mediterranean (World War I) 560:, with heavy loss of life. 2528: 1892:Battle of the St. Lawrence 1017:, where she was interned; 626: 471:(with some support by the 1621:Knight's Cross recipients 1492: 1408:Halpern, Paul G. (1995). 1391:Submarines at War 1914–18 1083:U-boats destroyed (Pola) 884:K/L Arnauld de la Perière 334: 184: 156: 141: 129: 2216:Italian battleship  2200:Russian battleship  1080:U-boats destroyed (KuK) 554:sank the French cruiser 2232:French battleship  2177:French battleship  1616:World War II commanders 607:in sections by rail to 510:Austro-Hungarian Empire 1611:World War I commanders 975: 914:Japanese participation 640:submarines at Pola in 583:The first U-boat sent— 164:1914 – 9 November 1918 1387:Compton-Hall, Richard 968: 900:Count Ottokar Czernin 539:torpedoed the French 400:Eastern Mediterranean 132:Mediterranean Theatre 2349:Metox radar detector 1571:Uncompleted projects 1244:, 2003, Page 186-187 904:Charles I of Austria 742:, followed later by 578:Dardanelles campaign 496:1914: Initial stages 40:improve this article 2329:FuG 200 Hohentwiel 1242:Dorling Kindersley 1240:– Willmott, H.P., 1211:Gallipoli Campaign 1074:Ships sunk (Pola) 976: 961:1918: Final stages 791:In November 1915, 524:straits of Otranto 380:Raid on Porto Buso 365:Blockade of Europe 2512:Submarine warfare 2479: 2478: 2475: 2474: 2395:Submarine warfare 2369:Sieglinde (decoy) 2302: 2301: 2218:Regina Margherita 2139: 2138: 1875:Major engagements 1197: 1196: 1068:Ships sunk (KuK) 896:Arthur Zimmermann 831:off Ireland, the 812:off the coast of 461:Mediterranean Sea 450: 449: 405:Strait of Otranto 370:Adriatic Campaign 360:Convoy operations 291: 290: 180: 179: 174:Mediterranean Sea 116: 115: 108: 90: 2519: 2420: 2151: 1925: 1920:U-boat flotillas 1578:Austro-Hungarian 1561:Foreign captured 1479: 1472: 1465: 1456: 1428:The Killing Time 1423: 1404: 1382: 1354: 1351: 1345: 1342: 1333: 1330: 1324: 1321: 1315: 1314: 1303: 1297: 1294: 1288: 1285: 1279: 1278: 1260: 1254: 1251: 1245: 1235: 1062: 713: 676:(in present-day 515:KuK Kriegsmarine 438: 329: 327: 317: 310: 303: 294: 287: 283: 281: 280: 273: 269: 267: 266: 259: 255: 253: 252: 245: 241: 239: 238: 230: 226: 224: 223: 216: 212: 210: 209: 202: 198: 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Routledge. 1411: 1406: 1402: 1400:1-55750-447-4 1396: 1392: 1388: 1384: 1380: 1378:1-904381-08-1 1374: 1370: 1365: 1364: 1360: 1353:Grey p223-224 1350: 1347: 1341: 1339: 1335: 1329: 1326: 1320: 1317: 1312: 1311:The Great War 1308: 1302: 1299: 1296:Venzon, p. 55 1293: 1290: 1284: 1281: 1276: 1274:0-8153-3353-6 1270: 1266: 1259: 1256: 1250: 1247: 1243: 1239: 1234: 1232: 1228: 1221: 1217: 1214: 1212: 1209: 1207: 1204: 1203: 1199: 1192: 1189: 1186: 1183: 1181: 1178: 1175: 1174: 1170: 1167: 1164: 1161: 1159: 1156: 1153: 1152: 1148: 1145: 1142: 1139: 1137: 1134: 1131: 1130: 1126: 1123: 1120: 1117: 1115: 1112: 1109: 1108: 1104: 1101: 1098: 1095: 1093: 1090: 1087: 1086: 1082: 1079: 1076: 1073: 1070: 1067: 1064: 1063: 1057: 1055: 1053: 1049: 1041: 1039: 1037: 1033: 1032: 1026: 1025: 1020: 1016: 1012: 1008: 1004: 998: 996: 992: 988: 984: 981: 972: 967: 960: 958: 956: 952: 951: 946: 942: 938: 934: 930: 926: 922: 913: 911: 907: 905: 901: 897: 889: 887: 885: 880: 878: 869: 867: 864: 860: 859: 853: 851: 850: 843: 841: 837: 835: 830: 829: 823: 819: 815: 811: 810: 804: 800: 799: 794: 786: 783: 781: 778: 773: 771: 767: 766: 761: 758:(64,873  757: 753: 749: 745: 741: 737: 732: 730: 726: 722: 718: 710: 709: 700: 698: 695: 691: 690: 685: 684: 679: 675: 671: 667: 666: 661: 660: 654: 652: 647: 643: 639: 634: 630: 629:Pola Flotilla 623:Pola Flotilla 622: 620: 618: 614: 610: 605: 604: 599: 598: 592: 588: 587: 581: 579: 571: 566: 564: 561: 559: 558: 557:LĂ©on Gambetta 553: 552: 547: 546: 542: 538: 537: 531: 527: 525: 521: 517: 516: 511: 507: 503: 495: 490: 488: 486: 482: 478: 474: 470: 469:German Empire 466: 462: 458: 443: 440: 436: 431: 428: 426: 423: 421: 418: 416: 413: 411: 408: 406: 403: 401: 398: 396: 393: 391: 388: 386: 383: 381: 378: 376: 373: 371: 368: 366: 363: 361: 358: 356: 353: 351: 348: 346: 345: 341: 337: 336: 333: 328: 318: 313: 311: 306: 304: 299: 298: 295: 286: 272: 258: 244: 232: 229: 215: 201: 189: 188: 183: 175: 171: 168: 167: 163: 160: 159: 155: 151: 145: 140: 137: 133: 128: 123: 118: 110: 107: 99: 88: 85: 81: 78: 74: 71: 67: 64: 60: 57: â€“  56: 52: 51:Find sources: 45: 41: 35: 34: 29:This article 27: 23: 18: 17: 2423:World War II 2359:Pillenwerfer 2344:Mark 24 mine 2319:Depth charge 2292: 2284: 2276: 2268: 2260: 2252:World War II 2241: 2233: 2225: 2217: 2209: 2201: 2193: 2186: 2178: 2170: 2162: 1979:World War II 1907: 1897:Convoy ONS 5 1887:Convoy PQ 17 1864: 1857: 1850: 1843: 1836: 1829: 1822: 1815: 1808: 1801: 1794: 1787: 1780: 1773: 1766: 1759: 1752: 1745: 1738: 1731: 1724: 1717: 1710: 1703: 1696: 1689: 1682: 1675: 1668: 1661: 1654: 1626:Erich Raeder 1538:U-boat lists 1526: 1518: 1506: 1441: 1427: 1409: 1390: 1368: 1349: 1328: 1323:Halpern p396 1319: 1310: 1307:Falls, Cyril 1301: 1292: 1283: 1264: 1258: 1249: 1237: 1045: 1030: 1023: 1018: 1010: 1006: 1002: 999: 994: 989: 985: 977: 970: 954: 949: 944: 940: 936: 932: 928: 924: 920: 917: 908: 893: 881: 873: 857: 854: 848: 844: 833: 827: 820:—bound from 817: 808: 796: 792: 790: 784: 774: 770:Cape Matapan 764: 743: 739: 735: 733: 706: 704: 688: 682: 672:and sent to 664: 658: 655: 650: 635: 632: 602: 596: 593:battleships 585: 582: 575: 562: 556: 550: 544: 535: 532: 528: 514: 499: 456: 454: 354: 343: 339: 185:Belligerents 149: 130:Part of the 117: 102: 93: 83: 76: 69: 62: 50: 38:Please help 33:verification 30: 2339:Leigh light 2324:Elektroboot 2154:World War I 1928:World War I 1882:Convoy SC 7 1816:Steinbrinck 1631:Karl Dönitz 1440:VE Tarrant 991:Karl Dönitz 708:Admiralstab 692:joined the 477:World War I 433: [ 425:2nd Durazzo 395:1st Durazzo 350:Dardanelles 136:World War I 96:August 2014 2486:Categories 2307:Technology 2277:Courageous 2187:Formidable 2171:Cornwallis 1802:Schlieffen 1753:Pfadfinder 1732:Kreuzotter 1669:Delphin II 1594:Commanders 1525:Operation 1519:Regenbogen 1517:Operation 1361:References 1165:1,514,050 1143:1,045,058 980:Alexandria 777:Type UB II 717:Suez Canal 678:Montenegro 541:battleship 66:newspapers 2354:Mousetrap 2293:Royal Oak 2291:HMS  2283:HMS  2275:HMS  2267:HMS  2261:Ark Royal 2259:HMS  2240:HMS  2224:HMS  2208:HMS  2185:HMS  2169:HMS  2163:Britannia 2161:HMS  1902:Black May 1830:Streitaxt 1823:Siegfried 1690:Eisteufel 1641:Wolfpacks 1527:Deadlight 1344:Grey p223 1287:Kemp p 17 1031:Britannia 1029:HMS  1015:Barcelona 828:Lusitania 826:RMS  756:long tons 729:Gibraltar 646:Type UC I 638:Type UB I 595:HMS  545:Jean Bart 150:Britannia 2448:Valentin 2444:Germany 2388:Concepts 2334:Hedgehog 2210:Majestic 2202:Peresvet 1955:Flanders 1908:Bismarck 1851:Weddigen 1844:Vorwärts 1788:Rossbach 1774:Raubgraf 1711:Hartmann 1389:(2004). 1309:(1961). 1200:See also 1187:761,060 1121:350,853 1077:Tonnage 1071:Tonnage 847:SS  836:incident 807:SS  787:incident 748:Salonika 603:Majestic 520:Adriatic 375:Antivari 285:Bulgaria 169:Location 2465:Dora II 2433:Lorient 2429:France 2379:Snorkel 2242:Triumph 2234:Suffren 2226:Russell 2194:Gaulois 1986:Regions 1960:Kurland 1837:TĂĽmmler 1809:Seewolf 1739:Leuthen 1725:Kiebitz 1697:Endrass 1676:Dränger 1655:BlĂĽcher 1583:Classes 1486:U-boats 1444:(1989) 1430:(1972) 1426:E Grey 863:Taranto 822:Messina 814:Tunisia 752:Kavalla 674:Cattaro 597:Triumph 491:History 459:in the 430:Premuda 344:Breslau 257:Germany 80:scholar 2460:Dora I 2455:Norway 2364:Q-ship 2269:Barham 2179:Danton 1795:Schill 1781:Rösing 1683:Eisbär 1662:Borkum 1546:German 1448:  1434:  1416:  1397:  1375:  1271:  1052:Toulon 1007:Surada 1003:Mercia 950:Sakaki 935:, and 849:Persia 834:Ancona 818:Ancona 809:Ancona 801:(K/L) 785:Ancona 727:, and 670:Baltic 642:Istria 512:, the 485:convoy 415:Imbros 390:Vieste 385:Ancona 340:Goeben 282:  268:  254:  240:  228:France 225:  211:  197:  82:  75:  68:  61:  53:  2415:Bases 2374:Sonar 2285:Eagle 1910:chase 1767:Prien 1760:Pfeil 1718:Hecht 1551:Types 1222:Notes 1176:1918 1154:1917 1132:1916 1127:none 1110:1915 1102:none 1088:1914 1065:Date 1058:Table 1024:UB-50 995:UB-68 971:UB-48 858:UC-12 725:Crete 721:Malta 712:' 502:Italy 437:] 420:Bakar 214:Italy 87:JSTOR 73:books 2147:sunk 1965:Pola 1865:Wolf 1858:West 1746:Lohs 1446:ISBN 1432:ISBN 1414:ISBN 1395:ISBN 1373:ISBN 1269:ISBN 1184:325 1140:415 1118:102 1105:n/a 1099:n/a 1096:n/a 1034:off 1019:U-34 1011:U-35 1005:and 974:Bark 955:U-27 941:U-30 937:U-23 933:U-20 929:U-16 925:U-10 921:U-13 793:U-38 765:U-38 750:and 744:U-35 740:U-39 738:and 736:U-33 689:U-39 686:and 683:U-33 665:U-35 662:and 659:U-34 651:U-21 609:Pola 600:and 586:U-21 567:1915 536:U-12 467:and 455:The 442:Pula 342:and 161:Date 148:HMS 59:news 2131:33. 2126:32. 2121:31. 2116:30. 2111:29. 2106:27. 2101:26. 2096:25. 2091:24. 2086:23. 2081:22. 2076:21. 2071:20. 2066:19. 2061:18. 2056:14. 2051:13. 2046:12. 2041:11. 2036:10. 1945:III 1704:Hai 1606:FdU 1601:BdU 1193:10 969:SM 957:). 945:U-3 551:U-5 134:of 42:by 2488:: 2031:9. 2026:8. 2021:7. 2016:6. 2011:5. 2006:4. 2001:3. 1996:2. 1991:1. 1950:IV 1940:II 1337:^ 1230:^ 1190:3 1179:? 1171:2 1168:1 1157:? 1149:1 1146:2 1135:? 1124:2 1113:? 1091:? 1038:. 931:, 927:, 923:, 886:. 816:. 723:, 719:, 619:. 526:. 435:fr 1935:I 1478:e 1471:t 1464:v 1422:. 1403:. 1381:. 1277:. 760:t 316:e 309:t 302:v 109:) 103:( 98:) 94:( 84:· 77:· 70:· 63:· 36:.

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Mediterranean Theatre
World War I

Mediterranean Sea
United Kingdom
Italy
France
Austria-Hungary
Germany
Ottoman Empire
Bulgaria
v
t
e
Mediterranean Operations 1914–1918
Goeben and Breslau
Dardanelles
U-boat Campaign
Convoy operations

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