Project ASS
Axis Submarine Successes, 1939-1945

Founded by Jürgen Rohwer

Database ‚ASS‘ is depending on the famous study „U-Boot-Erfolge der Achsenmächte 1939-1945“ by Prof. Jürgen Rohwer. The book was first published in 1968, planned to be volume 1 of a series „Dokumentationen der Bibliothek für Zeitgeschichte“ (Stuttgart).

After the end of Second World War Rohwer had come into contact with the “Naval Historical Team”, a group of German naval officers, who, at behest of the Anglo-American Allies, were busy to report the military experiences and intentions of the German Navy during the war. Commanders Günter Hessler and Alfred Hoschatt, in Brunsbüttel, were ordered to write a detailed account of German submarine warfare in the Atlantic for the British Ministry of Defence. For their studies, they obtained all necessary information from the Naval Historical Branch of the British Admiralty, such as the collection of German torpedo firing reports, information on attacked British and Foreign merchant vessels, and warships lost or damaged by enemy action during the war. But the study was kept under wraps and was not published until 1989.

For this reason Rohwer drew up his own listings of submarine attacks, no simple task under the condition, that there was no possibility of access to the U-boat logs, being treasured in Anglo-American archives until 1985. To make comparisons easier, Rohwer entered all data on U-boat attacks, found in the war diary oft the former Commander U-Boats, Admiral Karl Dönitz, on beschreibung cards. The war diary of Dönitz was personally typewrited from the original document, which had to be returned to Naval Archives in London when Hessler and Hoschatt had finished their work.

Rohwer‘s „Torpedo Attacks Index“ doesn’t only contain the successful attacks of Axis sub-marines, but in addition to 5700 ASS records there are about 3000 beschreibung cards with missing attacks. They should perhaps be part of the data base. But there are some reasons that prevented me from doing so. First, this task would probably require a time of 100 working days. Moreover, the information on torpedo misses don’t lead to sufficient knowledge. For the evaluation of attacks and successes it is absolutely necessary to study the u-boat war logs, as well as the observations from Allied escort groups.

„U-Boot-Erfolge der Achsenmächte“ got revised by Prof. Rohwer at two times in distances of 15 years. As no German publisher was interested any more, his book was published under the titel „Axis Submarine Successes, 1939-1945“ by US Naval Institute (Annapolis, Md.) in 1983, and by Leo Leventhal (Greenhill, London) in 1998, the later edition already supported by Thomas Weis. Now, 15 years later a revised edition being necessary, it was pub¬lished as data base by “Historisches Marinearchiv”. Thanks a lot for the technical support of Thorsten Reich!

The data base was constructed by myself in preparation of book redaction 1996-1997, she was the appropriate instrument to enter all corrections and reassessments, which had been gathered since 1983 edition, as well as objections following the 1998 edition.

It is quite impossible to thank to all informers at this place (I would recommend in¬terested readers to the prefaces of the three book editions); but the most important institu¬tions and helpers with my part of engagement have to be counted. In the 60th it has been the „Ufficio Storico della Marina Militare“ (Giuseppe Fioravanzo), the „Naval Historical Branch“ of the British Admiralty (Robert Coppock), the Chief of the „Office for Military History of Japanese Self-Defence Forces “ (KAdm. Sakamoto), for the French side Dr. Claude Huan und in Germany Karl Dönitz, Eberhard Godt und Günter Hessler. For the 70th Prof. Rohwer remembers on many American colleagues, such as Dean Allard, Bernard Cavalcante, on British helpers like Brian Schofield and Peter Gretton. In the 90th Prof. Rohwer and me got essential help from Frans Beckers, Walter Cloots und Eric Zimmerman (project „duikboot“), and for the now revised 2013 data base I’ve got a big deal of indispensable information from Rainer Kolbicz. In completion to ASS, I urgently recommend you to Rainer’s famous project „Attacked Ships“ (, part the of meritorious Printed sources being were used for ASS are a legend of its own. They should be cited on a separate directorate of this website.

We are furthermore mostly interested in completion, emendation, and corrections. They should be posted in „Forum Marinearchiv“ for the benefit of all partners and readers.
Come to ASS-Forum: -->

In his book "U-Boote - Chronik in Bildern", Oldenburg 1961, Jürgen Rohwer has published a statistical evaluation of German submarine successes in form of a table.
Thomas Weis is going to revise the tables soon, the original statistics can be treated here (click for enlargement).

5782 records were found   

Ergebnisseite 1 von 78
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Attacker Attacked
Details Area Date Time Nat. U-Boat Weapon Convoy Nat. Name Tonnage Hit Position
 W03.09.193919:39dt U 30 T br Athenia 13581 BRT +56.44n 14.05w
 W05.09.193908:15dt U 47 TA br Bosnia 2407 BRT +45.29n 09.45w
 W05.09.193912:25dt U 48 TA br Royal Sceptre 4853 BRT +46.23n 14.59w
 W06.09.193906:00dt U 38 TA br Manaar 7242 BRT +38.28n 10.50w
 W06.09.193914:40dt U 47 TA br Rio Claro 4086 BRT +46.30n 12.00w
 W07.09.193913:30dt U 34 TA br Pukkastan 5809 BRT +49.23n 07.49w
 W07.09.193915:55dt U 33 T br Olivegrove 4060 BRT +49.05n 15.58w
 W07.09.193917:47dt U 47 A br Gartavon 1777 BRT +47.04n 11.32w
 W08.09.193908:30dt U 48 T br Winkleigh 5055 BRT +48.06n 18.12w
 W08.09.193912:15dt U 29 T br Regent Tiger 10176 BRT +49.57n 15.34w
 W08.09.193918:13dt U 34 TA br Kennebec 5548 BRT +49.18n 08.13w
 W08.09.193918:15dt U 52 T ---- -- --BE 5218
W10.09.193906:10dt U 15 M br Goodwood 2796 BRT +1sm SE Flamborough Head
W10.09.193917:25dt U 13 M br Magdapur 8641 BRT +52.11n 01.43e
W11.09.193904:24dt U 30 TA br Blairlogie 4425 BRT +54.58n 15.14w
 W11.09.193913:35dt U 48 TA br Firby 4869 BRT +59.40n 13.50w
 W11.09.193913:50dt U 38 TA br Inverliffey 9456 BRT +48.14n 11.48w
W13.09.1939dt U 17 M br Hawarden Castle 210 BRT +51.07n 01.27e
W13.09.193914:55dt U 27 A br Davara 291 BRT +21sm NWzN Tory Island
 W13.09.193915:30dt U 29 TA br Neptunia 798 BRT +49.20n 14.40w
 W14.09.193910:00dt U 28 T br Vancouver City 4955 BRT +51.23n 07.03w
 W14.09.193914:15dt U 29 TA br British Influence 8431 BRT +49.43n 12.49w
W14.09.193918:20dt U 30 TA br Fanad Head 5200 BRT +56.43n 15.21w
W15.09.1939dt U 26 M be Alex van Opstal 5965 BRT +near Shambles LV.
 W15.09.193915:44dt U 53 TA br Cheyenne 8825 BRT +50.20n 13.30w
 W15.09.193919:00dt U 36 TA br Truro 974 BRT +58.20n 02.00e
 W16.09.193907:00dt U 33 A br Arkleside 1567 BRT +48.00n 09.30w
 W16.09.193900:30dt U 31 T OB.4 ---- -- --BE 3681
 W16.09.1939a08:15dt U 31 T OB.4 br Aviemore 4060 BRT +49.11n 13.38w
W16.09.1939b08:27dt U 31 T OB.4 Zerstörer /BE 3850
W16.09.1939dt U 13 M br City of Paris 10902 BRT =52.14n 01.43w
W16.09.193915:53dt U 27 S br Rudyard Kipling 333 BRT +53.50n 11.10w
W16.09.193905:05dt U 41 - fi Vega 1073 BRT p58n 04e
W16.09.193906:00dt U 41 - fi Suomen Poika 1099 BRT p58n 04e
 W17.09.193915:40dt U 53 T br Kafiristan 5193 BRT +50.16n 16.55w
 W17.09.193919:50dt U 29 T Task F. br Courageous 22500 ts +50.10n 14.45w
 W18.09.193912:38dt U 32 A br Kensington Court 4863 BRT +50.31n 08.27w
W18.09.1939a18:48dt U 35 A br Arlita 326 BRT +57.51n 09.28w
W18.09.1939b19:00dt U 35 A br Lord Minto 295 BRT +57.51n 09.28w
W19.09.1939 ? br Wellvale 271 BRT +35sm NNE Hebrides
W20.09.193918:52 M br Kittiwake 530 ts =nr Shambles LV
 W21.09.193914:10dt U 35 T OA.7 br Teakwood 6014 BRT =49.39n 06.39w
 W22.09.193914:18dt U 21 T unknown Zerstörer --AN 5182
 W22.09.193914:30dt U 7 T br Akenside 2694 BRT +60.07n 04.37e
 W22.09.193923:00dt U 4 S fi Martti Ragnar 2262 BRT +5sm S Arendal
 W23.09.193911:20dt U 4 S fi Walma 1361 BRT +58.15n 11.00e
 W23.09.193913:28dt U 24 T br Kreuzer --AN 4181
W24.09.193901:00dt U 13 M fr Phryné 2660 BRT +3.5sm E Aldeburgh LV.
 W24.09.193908:00dt U 33 A br Caldew 287 BRT +60.47n 06.20w
 W24.09.193912:50dt U 31 TA br Hazelside 4646 BRT +51.17n 09.22w
 W24.09.193910:37dt U 4 T sw Gertrud Bratt 1510 BRT +58.40n 09.52e
W24.09.193914:30dt U 34 - es Hanonia 1781 BRT pnear Norway
 W25.09.193905:55dt U 36 TS sw Silesia 1839 BRT +45sm WNW Ekkeröy
W27.09.193906:10dt U 36 - sw Algeria 1617 BRT pSweden - Italia
 W28.09.193900:30dt U 16 T sw Nyland 3378 BRT +45sm SW Stavanger
W28.09.193911:30dt U 36 - nw Solaas 1368 BRT --AN 3567
 W28.09.193915:37dt U 32 S nw Jern 875 BRT +65sm W Skudenes
 W28.09.193921:30dt U 22 T Unterseeboot --AN 6277
 W29.09.193908:55dt U 7 TA nw Takstaas 1830 BRT +60.15n 04.41e
 W30.09.193911:40dt U 3 T Vendia 1150 BRT +35sm NW Hanstholm
 W30.09.193921:08dt U 3 T sw Gun 1198 BRT +30sm NW Hanstholm
 W01.10.193918:45dt U 35 TA be Suzon 2239 BRT +42sm W Quessant
 W03.10.193913:50dt U 35 T gr Diamantis 4990 BRT +40sm W Skellings
 W04.10.193904:45dt U 23 TA br Glen Farg 876 BRT +58.52n 01.31w
W05.10.1939dt U 32 M br Marwarri 8063 BRT =3.5sm 190° Scarweather LV
W06.10.193916:20dt U 32 M br Lochgoil 9462 BRT =51.24n 04.00w
W07.10.1939dt U 26 M nl Binnendijk 6873 BRT +2.5sm SE Shambles LV.
 W08.10.193914:04dt U 37 A sw Vistula 1018 BRT +45sm N Muggle Flugga (She
 W12.10.193918:08dt U 48 T KJ.2 s fr Emile Miguet 14115 BRT +50.15n 14.50w
 W12.10.193918:05dt U 37 TA gr Aris 4810 BRT +53.28n 14.30w
 W12.10.193919:45dt U 48 TA OB.17 s br Heronspool 5202 BRT +50.13n 14.48w
W13.10.193907:30dt U 42 A OB.17 d br Stonepool 4803 BRT =48.40n 15.30w
 W13.10.193908:14dt U 48 A OA.17 d fr Louisiane 6903 BRT +50.14n 15.02w
 W13.10.1939a23:58dt U 47 T Schlachtschiff --Scapa Flow
 W14.10.1939b01:16dt U 47 T br Royal Oak 29150 ts +58.55n 02.59w
Ergebnisseite 1 von 78
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