| Date | U-boat | Commander | | Name of ship | Tons | Nat. |
| |
| Apr 1917 | | | | Frixos | 3,531 |  | gr |
| 1 Apr 1917 | | | | Kasenga | 4,652 |  | br |
| 1 Apr 1917 | | | | Tithonus (d.) | 3,463 |  | br |
| 1 Apr 1917 | U 46 | Leo Hillebrand | | Aztec | 3,727 |  | am |
| 1 Apr 1917 | U 54 | Volkhard von Bothmer | | Consul Persson | 1,835 |  | nw |
| 1 Apr 1917 | U 54 | Volkhard von Bothmer | | Fjelland | 387 |  | nw |
| 1 Apr 1917 | U 63 | Otto Schultze | | Zambesi | 3,759 |  | br |
| 1 Apr 1917 | U 65 | Hermann von Fischel | | Maria T. | 45 |  | it |
| 1 Apr 1917 | U 65 | Hermann von Fischel | | Maria Santissima D. Grazie | 35 |  | it |
| 1 Apr 1917 | UB 35 | Rudolf Gebeschus | | Camilla | 2,273 |  | nw |
| 1 Apr 1917 | UB 35 | Rudolf Gebeschus | | Ester | 1,210 |  | da |
| 1 Apr 1917 | UB 36 | Harald von Keyserlingk | | Jolie Brise | 18 |  | fr |
| 1 Apr 1917 | UB 36 | Harald von Keyserlingk | | Providence De Dieu | 15 |  | fr |
| 1 Apr 1917 | UB 39 | Heinrich Küstner | | Silvia | 164 |  | br |
| 1 Apr 1917 | UB 42 | Fritz Wernicke | | Unidentified Sailing Vessel | 150 |  | gr |
| 1 Apr 1917 | UC 38 | Alfred Klatt | | Warren | 3,709 |  | br |
| 1 Apr 1917 | UC 40 | Gustav Deuerlich | | Bergenhus | 1,017 |  | da |
| 1 Apr 1917 | UC 72 | Ernst Voigt | | Eastern Belle | 97 |  | br |
| 2 Apr 1917 | | | | Anna Fostenes | 2,577 |  | nw |
| 2 Apr 1917 | U 54 | Volkhard von Bothmer | | Havlyst | 532 |  | nw |
| 2 Apr 1917 | U 59 | Wilhelm von Fircks | | Snespurven | 1,409 |  | nw |
| 2 Apr 1917 | U 65 | Hermann von Fischel | | Britannia | 3,129 |  | br |
| 2 Apr 1917 | U 78 | Otto Dröscher | | Sagitta | 1,981 |  | nw |
| 2 Apr 1917 | UB 35 | Rudolf Gebeschus | | Lord Scarborough | 158 |  | br |
| 2 Apr 1917 | UC 38 | Alfred Klatt | | Filicudi | 257 |  | it |
| 3 Apr 1917 | U 35 | Lothar von Arnauld de la Perière | | Ardgask | 4,542 |  | br |
| 3 Apr 1917 | U 46 | Leo Hillebrand | | Hesperus | 2,231 |  | ru |
| 3 Apr 1917 | U 65 | Hermann von Fischel | | Maria Ferrara | 106 |  | it |
| 3 Apr 1917 | UB 43 | Hans von Mellenthin | | Vasilefs Constantinos | 4,070 |  | gr |
| 3 Apr 1917 | UC 22 | Heino von Heimburg | | Cloughton (d.) | 4,221 |  | br |
| 3 Apr 1917 | UC 22 | Heino von Heimburg | | Oberon (d.) | 5,142 |  | br |
| 3 Apr 1917 | UC 37 | Otto Launburg | | Ernest Simons | 5,555 |  | fr |
| 3 Apr 1917 | UC 37 | Otto Launburg | | Saint Simon | 3,419 |  | fr |
| 3 Apr 1917 | UC 38 | Alfred Klatt | | Annunziata A | 206 |  | it |
| 3 Apr 1917 | UC 38 | Alfred Klatt | | Caterina R. | 214 |  | it |
| 3 Apr 1917 | UC 38 | Alfred Klatt | | Domenico | 260 |  | it |
| 3 Apr 1917 | UC 38 | Alfred Klatt | | Nuova Maria Di Porto Salvo | 48 |  | it |
| 3 Apr 1917 | UC 71 | Hans Valentiner | | Ellen James | 165 |  | br |
| 4 Apr 1917 | | | | Hundvaago (d.) | 1,901 |  | nw |
| 4 Apr 1917 | U 35 | Lothar von Arnauld de la Perière | | Marguerite | 1,553 |  | am |
| 4 Apr 1917 | U 35 | Lothar von Arnauld de la Perière | | Parkgate | 3,232 |  | br |
| 4 Apr 1917 | U 52 | Hans Walther | | Missourian | 7,924 |  | am |
| 4 Apr 1917 | U 52 | Hans Walther | | Ravenna | 4,101 |  | it |
| 4 Apr 1917 | U 55 | Wilhelm Werner | | H. B. Linnemann (d.) | 444 |  | da |
| 4 Apr 1917 | U 60 | Karl Georg Schuster | | Domingo | 2,131 |  | it |
| 4 Apr 1917 | U 63 | Otto Schultze | | Margit | 2,490 |  | br |
| 4 Apr 1917 | U 78 | Otto Dröscher | | Vladimir Reitz | 2,128 |  | da |
| 4 Apr 1917 | UB 23 | Hans Ewald Niemer | | Trevier | 3,006 |  | be |
| 4 Apr 1917 | UB 32 | Max Viebeg | | Parana | 4,461 |  | bz |
| 4 Apr 1917 | UB 35 | Rudolf Gebeschus | | Gibraltar | 188 |  | br |
| 4 Apr 1917 | UB 35 | Rudolf Gebeschus | | Maggie Ross | 183 |  | br |
| 4 Apr 1917 | UC 30 | Heinrich Stenzler | | Hunstanton | 4,504 |  | br |
| 4 Apr 1917 | UC 30 | Heinrich Stenzler | | Monte Protegido | 281 |  | ar |
| 4 Apr 1917 | UC 31 | Otto von Schrader | | Helga | 839 |  | da |
| 4 Apr 1917 | UC 35 | Ernst von Voigt | | City Of Paris | 9,191 |  | br |
| 4 Apr 1917 | UC 37 | Otto Launburg | | San Giovanni Battiste | 46 |  | it |
| 4 Apr 1917 | UC 71 | Hans Valentiner | | Pensiero | 2,632 |  | it |
| 5 Apr 1917 | U 46 | Leo Hillebrand | | Benheather | 4,701 |  | br |
| 5 Apr 1917 | U 52 | Hans Walther | | Angel Marina | 257 |  | it |
| 5 Apr 1917 | U 55 | Wilhelm Werner | | Vilja | 1,049 |  | nw |
| 5 Apr 1917 | U 57 | Carl-Siegfried Ritter von Georg | | Ebenezer | 181 |  | da |
| 5 Apr 1917 | U 59 | Wilhelm von Fircks | | Canadian | 9,309 |  | br |
| 5 Apr 1917 | U 63 | Otto Schultze | | Solstad | 4,147 |  | nw |
| 5 Apr 1917 | U 65 | Hermann von Fischel | | Calliope | 3,829 |  | br |
| 5 Apr 1917 | U 78 | Otto Dröscher | | Bris | 101 |  | da |
| 5 Apr 1917 | U 86 | Friedrich Crüsemann | | Dunkerquoise | 127 |  | fr |
| 5 Apr 1917 | U 86 | Friedrich Crüsemann | | Marie Celine | 142 |  | fr |
| 5 Apr 1917 | U 86 | Friedrich Crüsemann | | Siberier | 2,968 |  | be |
| 5 Apr 1917 | UB 32 | Max Viebeg | | Ernest Legouve | 2,246 |  | fr |
| 5 Apr 1917 | UB 39 | Heinrich Küstner | | Dicto | 2,363 |  | nw |
| 5 Apr 1917 | UC 22 | Heino von Heimburg | | Agia | 20 |  | gr |
| 5 Apr 1917 | UC 22 | Heino von Heimburg | | Evangelistria | 29 |  | gr |
| 5 Apr 1917 | UC 22 | Heino von Heimburg | | Kyriotis | 19 |  | gr |
| 5 Apr 1917 | UC 31 | Otto von Schrader | | N. J. Fjord | 1,425 |  | da |
| 5 Apr 1917 | UC 71 | Hans Valentiner | | Gower Coast | 804 |  | br |
| 5 Apr 1917 | UC 71 | Hans Valentiner | | San Fulgencio | 1,558 |  | sp |
| 6 Apr 1917 | U 55 | Wilhelm Werner | | Vine Branch | 3,442 |  | br |
| 6 Apr 1917 | U 59 | Wilhelm von Fircks | | Roland | 135 |  | fr |
| 6 Apr 1917 | U 60 | Karl Georg Schuster | | Marion | 1,587 |  | nw |
| 6 Apr 1917 | U 66 | Thorwald von Bothmer | | Powhatan | 6,117 |  | br |
| 6 Apr 1917 | U 86 | Friedrich Crüsemann | | Rosalind | 6,535 |  | br |
| 6 Apr 1917 | UB 35 | Rudolf Gebeschus | | Kongshaug | 380 |  | nw |
| 6 Apr 1917 | UB 35 | Rudolf Gebeschus | | Lord Kitchener | 161 |  | br |
| 6 Apr 1917 | UB 35 | Rudolf Gebeschus | | Recto | 177 |  | br |
| 6 Apr 1917 | UB 39 | Heinrich Küstner | | La Tour D’auvergne | 188 |  | fr |
| 6 Apr 1917 | UB 39 | Heinrich Küstner | | Perce Neige | 141 |  | fr |
| 6 Apr 1917 | UC 25 | Johannes Feldkirchner | | Cybele | 148 |  | fr |
| 6 Apr 1917 | UC 27 | Gerhard Schulz | | Narberth Castle | 168 |  | br |
| 6 Apr 1917 | UC 27 | Gerhard Schulz | | Nestor | 176 |  | br |
| 6 Apr 1917 | UC 31 | Otto von Schrader | | Strathrannoch | 215 |  | br |
| 6 Apr 1917 | UC 34 | Robert Sprenger | | Rahmanich | 100 |  | ag |
| 6 Apr 1917 | UC 34 | Robert Sprenger | | Spithead | 4,697 |  | br |
| 6 Apr 1917 | UC 40 | Gustav Deuerlich | | Presto | 1,143 |  | br |
| 6 Apr 1917 | UC 65 | Otto Steinbrinck | | Thelma | 1,350 |  | nw |
| 7 Apr 1917 | U 35 | Lothar von Arnauld de la Perière | | Maplewood | 3,239 |  | br |
| 7 Apr 1917 | U 46 | Leo Hillebrand | | Fiskaa | 1,700 |  | nw |
| 7 Apr 1917 | U 52 | Hans Walther | | Seward | 3,390 |  | am |
| 7 Apr 1917 | U 60 | Karl Georg Schuster | | Salmo | 1,721 |  | br |
| 7 Apr 1917 | U 65 | Hermann von Fischel | | Trefusis | 2,642 |  | br |
| 7 Apr 1917 | U 78 | Otto Dröscher | | Jason | 810 |  | br |
| 7 Apr 1917 | UC 25 | Johannes Feldkirchner | | Edwin R. Hunt | 1,132 |  | am |
| 7 Apr 1917 | UC 65 | Otto Steinbrinck | | Lapland (d.) | 18,565 |  | br |
| 7 Apr 1917 | UC 71 | Hans Valentiner | | Caminha | 2,763 |  | pt |
| 8 Apr 1917 | | | | Nuovo San Francesco | 101 |  | it |
| 8 Apr 1917 | U 52 | Hans Walther | | Alba | 1,639 |  | it |
| 8 Apr 1917 | U 55 | Wilhelm Werner | | Petridge | 1,712 |  | br |
| 8 Apr 1917 | U 55 | Wilhelm Werner | | Torrington | 5,597 |  | br |
| 8 Apr 1917 | U 55 | Wilhelm Werner | | Umvoti | 2,616 |  | br |
| 8 Apr 1917 | U 65 | Hermann von Fischel | | Lucia | 138 |  | it |
| 8 Apr 1917 | U 65 | Hermann von Fischel | | Papa Gian Battista | 138 |  | it |
| 8 Apr 1917 | UB 47 | Hans Hermann Wendlandt | | Livatho | 2,922 |  | gr |
| 8 Apr 1917 | UB 47 | Hans Hermann Wendlandt | | Nestos | 4,060 |  | gr |
| 8 Apr 1917 | UC 34 | Robert Sprenger | | Geilan Bahri | 19 |  | br |
| 9 Apr 1917 | U 52 | Hans Walther | | Esterel | 2,574 |  | fr |
| 9 Apr 1917 | U 59 | Wilhelm von Fircks | | Fremad I | 1,554 |  | nw |
| 9 Apr 1917 | U 75 | Curt Beitzen | | Ganslei | 1,273 |  | ru |
| 9 Apr 1917 | UB 31 | Thomas Bieber | | Kittiwake | 1,866 |  | br |
| 9 Apr 1917 | UB 39 | Heinrich Küstner | | Saint Maudez | 292 |  | fr |
| 9 Apr 1917 | UC 14 | Ulrich Pilzecker | | Orthos | 218 |  | br |
| 9 Apr 1917 | UC 65 | Otto Steinbrinck | | New York (d.) | 10,798 |  | am |
| 9 Apr 1917 | UC 71 | Hans Valentiner | | Themistoclis | 1,895 |  | gr |
| 9 Apr 1917 | UC 71 | Hans Valentiner | | Valhall | 750 |  | nw |
| 10 Apr 1917 | U 32 | Kurt Hartwig | | Porto Di Rodi | 2,480 |  | it |
| 10 Apr 1917 | k.u.k. U29 | Leo Prásil | | Dalton | 3,486 |  | br |
| 10 Apr 1917 | UB 20 | Hermann Glimpf | | Pluto | 1,266 |  | br |
| 10 Apr 1917 | UC 20 | Franz Becker | | Abd Razik | 25 |  | tu |
| 10 Apr 1917 | UC 26 | Matthias Graf von Schmettow | | P 26 | 613 |  | br |
| 10 Apr 1917 | UC 26 | Matthias Graf von Schmettow | | Salta | 7,284 |  | br |
| 10 Apr 1917 | UC 34 | Robert Sprenger | | Fotis (d.) | 3,526 |  | gr |
| 10 Apr 1917 | UC 71 | Hans Valentiner | | Ranvik | 5,848 |  | nw |
| 11 Apr 1917 | U 30 | Franz Grünert | | Nancy | 1,325 |  | da |
| 11 Apr 1917 | U 30 | Franz Grünert | | Saxo | 711 |  | da |
| 11 Apr 1917 | U 30 | Franz Grünert | | Star | 818 |  | nw |
| 11 Apr 1917 | U 30 | Franz Grünert | | Sylfiden | 796 |  | nw |
| 11 Apr 1917 | U 35 | Lothar von Arnauld de la Perière | | Miss Morris | 156 |  | br |
| 11 Apr 1917 | U 50 | Gerhard Berger | | Sarvsfos | 1,462 |  | nw |
| 11 Apr 1917 | U 52 | Hans Walther | | Ansgar | 301 |  | da |
| 11 Apr 1917 | U 65 | Hermann von Fischel | | Tremorvah | 3,654 |  | br |
| 11 Apr 1917 | UB 38 | Wilhelm Amberger | | Precedent | 36 |  | br |
| 11 Apr 1917 | UB 47 | Hans Hermann Wendlandt | | Cyfarthfa | 3,014 |  | br |
| 11 Apr 1917 | UC 20 | Franz Becker | | Candia | 1,045 |  | it |
| 11 Apr 1917 | UC 26 | Matthias Graf von Schmettow | | Amy | 270 |  | br |
| 11 Apr 1917 | UC 26 | Matthias Graf von Schmettow | | Branksome Hall (d.) | 4,262 |  | br |
| 11 Apr 1917 | UC 26 | Matthias Graf von Schmettow | | Duchess Of Cornwall | 1,706 |  | br |
| 11 Apr 1917 | UC 31 | Otto von Schrader | | Quaggy | 993 |  | br |
| 11 Apr 1917 | UC 34 | Robert Sprenger | | Imperial Transport | 4,648 |  | br |
| 12 Apr 1917 | U 30 | Franz Grünert | | Kolaastind | 2,368 |  | nw |
| 12 Apr 1917 | U 32 | Kurt Hartwig | | Kildale | 3,830 |  | br |
| 12 Apr 1917 | U 35 | Lothar von Arnauld de la Perière | | India | 2,933 |  | gr |
| 12 Apr 1917 | U 52 | Hans Walther | | Glencliffe | 3,673 |  | br |
| 12 Apr 1917 | U 55 | Wilhelm Werner | | Toro | 3,066 |  | br |
| 12 Apr 1917 | U 65 | Hermann von Fischel | | Angela M. | 187 |  | it |
| 12 Apr 1917 | k.u.k. U27 | Robert Teufl von Fernland | | Niritos | 3,756 |  | gr |
| 12 Apr 1917 | UB 38 | Wilhelm Amberger | | Lismore | 1,305 |  | br |
| 12 Apr 1917 | UC 27 | Gerhard Schulz | | Ernst Sophie | 222 |  | ru |
| 12 Apr 1917 | UC 31 | Otto von Schrader | | Dina Hinderika | 200 |  | nl |
| 12 Apr 1917 | UC 31 | Otto von Schrader | | Neptunus | 209 |  | nl |
| 12 Apr 1917 | UC 31 | Otto von Schrader | | Union | 152 |  | da |
| 12 Apr 1917 | UC 31 | Otto von Schrader | | Voorwaarts | 147 |  | nl |
| 12 Apr 1917 | UC 38 | Alfred Klatt | | Monviso (d.) | 4,020 |  | it |
| 12 Apr 1917 | UC 71 | Hans Valentiner | | Edelweiss | 192 |  | fr |
| 12 Apr 1917 | UC 76 | Wilhelm Barten | | Caliban | 215 |  | br |
| 12 Apr 1917 | UC 76 | Wilhelm Barten | | Chinkiang | 125 |  | br |
| 12 Apr 1917 | UC 76 | Wilhelm Barten | | Crown Prince | 103 |  | br |
| 12 Apr 1917 | UC 76 | Wilhelm Barten | | Equerry | 168 |  | br |
| 12 Apr 1917 | UC 76 | Wilhelm Barten | | Fife Ness | 123 |  | br |
| 12 Apr 1917 | UC 76 | Wilhelm Barten | | Largo Bay | 125 |  | br |
| 12 Apr 1917 | UC 76 | Wilhelm Barten | | Lillian | 120 |  | br |
| 12 Apr 1917 | UC 76 | Wilhelm Barten | | Osprey | 106 |  | br |
| 13 Apr 1917 | U 30 | Franz Grünert | | Bokn | 336 |  | nw |
| 13 Apr 1917 | U 30 | Franz Grünert | | Frixos | 2,471 |  | fi |
| 13 Apr 1917 | U 30 | Franz Grünert | | Gama | 107 |  | nw |
| 13 Apr 1917 | U 30 | Franz Grünert | | Glenlora | 805 |  | nw |
| 13 Apr 1917 | U 30 | Franz Grünert | | Zara | 1,331 |  | br |
| 13 Apr 1917 | U 35 | Lothar von Arnauld de la Perière | | Giuseppe Accame | 3,224 |  | it |
| 13 Apr 1917 | U 35 | Lothar von Arnauld de la Perière | | Odysseus | 3,463 |  | gr |
| 13 Apr 1917 | U 35 | Lothar von Arnauld de la Perière | | Stromboli | 5,466 |  | it |
| 13 Apr 1917 | U 78 | Otto Dröscher | | Strathcona | 1,881 |  | ca |
| 13 Apr 1917 | U 84 | Walter Roehr | | Argyll | 3,547 |  | br |
| 13 Apr 1917 | U 84 | Walter Roehr | | Lime Branch (d.) | 5,379 |  | br |
| 13 Apr 1917 | UB 38 | Wilhelm Amberger | | Maria | 175 |  | br |
| 13 Apr 1917 | UC 26 | Matthias Graf von Schmettow | | Gambetta | 39 |  | fr |
| 13 Apr 1917 | UC 27 | Gerhard Schulz | | Kariba | 3,697 |  | br |
| 13 Apr 1917 | UC 41 | Kurt Bernis | | Breadalbane (d.) | 112 |  | br |
| 13 Apr 1917 | UC 41 | Kurt Bernis | | Stork | 152 |  | br |
| 13 Apr 1917 | UC 44 | Kurt Tebbenjohanns | | Bandon | 1,456 |  | br |
| 13 Apr 1917 | UC 76 | Wilhelm Barten | | Pitsruan | 206 |  | br |
| 14 Apr 1917 | U 30 | Franz Grünert | | Fjeldli | 954 |  | nw |
| 14 Apr 1917 | U 35 | Lothar von Arnauld de la Perière | | Patagonier | 3,832 |  | br |
| 14 Apr 1917 | U 52 | Hans Walther | | Tres Macs | 163 |  | pt |
| 14 Apr 1917 | U 78 | Otto Dröscher | | Andromache | 313 |  | br |
| 14 Apr 1917 | UB 42 | Fritz Wernicke | | Veronica (d.) | 1,200 |  | br |
| 14 Apr 1917 | UC 20 | Franz Becker | | Cinque Ottobre | 39 |  | it |
| 14 Apr 1917 | UC 20 | Franz Becker | | Progresso | 31 |  | it |
| 14 Apr 1917 | UC 26 | Matthias Graf von Schmettow | | Tom | 2,413 |  | sp |
| 14 Apr 1917 | UC 31 | Otto von Schrader | | Spray | 1,072 |  | br |
| 14 Apr 1917 | UC 33 | Martin Schelle | | Hermione | 4,011 |  | br |
| 14 Apr 1917 | UC 37 | Otto Launburg | | Gange | 6,886 |  | fr |
| 14 Apr 1917 | UC 50 | Rudolf Seuffer | | Venus | 725 |  | nw |
| 15 Apr 1917 | | | | Alert | 777 |  | br |
| 15 Apr 1917 | U 30 | Franz Grünert | | Paris | 1,634 |  | nw |
| 15 Apr 1917 | U 33 | Gustav Sieß | | Cameronia | 10,963 |  | br |
| 15 Apr 1917 | U 35 | Lothar von Arnauld de la Perière | | Panaghi Drakatos | 2,734 |  | gr |
| 15 Apr 1917 | U 52 | Hans Walther | | Cabo Blanco (d.) | 2,163 |  | sp |
| 15 Apr 1917 | U 55 | Wilhelm Werner | | Astræa | 260 |  | da |
| 15 Apr 1917 | U 75 | Curt Beitzen | | Arctic Prince (d.) | 194 |  | br |
| 15 Apr 1917 | U 93 | Edgar von Spiegel von und zu Peckelsheim | | Fram | 105 |  | da |
| 15 Apr 1917 | k.u.k. U29 | Leo Prásil | | Mashobra | 8,173 |  | br |
| 15 Apr 1917 | UB 40 | Hans Howaldt | | Möhlenpris | 638 |  | nw |
| 15 Apr 1917 | UC 20 | Franz Becker | | Alessio Cocco | 29 |  | it |
| 15 Apr 1917 | UC 27 | Gerhard Schulz | | Gretaston | 3,395 |  | br |
| 15 Apr 1917 | UC 31 | Otto von Schrader | | Brothertoft | 155 |  | br |
| 15 Apr 1917 | UC 44 | Kurt Tebbenjohanns | | Dalmatian | 186 |  | br |
| 15 Apr 1917 | UC 44 | Kurt Tebbenjohanns | | Heikina | 157 |  | nl |
| 15 Apr 1917 | UC 44 | Kurt Tebbenjohanns | | Sutterton | 160 |  | br |
| 15 Apr 1917 | UC 74 | Wilhelm Marschall | | Arcadian | 8,939 |  | br |
| 16 Apr 1917 | U 33 | Gustav Sieß | | Sontay | 7,247 |  | fr |
| 16 Apr 1917 | U 43 | Hellmuth Jürst | | Anne | 240 |  | da |
| 16 Apr 1917 | U 43 | Hellmuth Jürst | | Endymion | 1,345 |  | ru |
| 16 Apr 1917 | U 43 | Hellmuth Jürst | | Towergate | 3,697 |  | br |
| 16 Apr 1917 | U 52 | Hans Walther | | Crios | 4,116 |  | pt |
| 16 Apr 1917 | U 60 | Karl Georg Schuster | | Queen Mary | 5,658 |  | br |
| 16 Apr 1917 | k.u.k. U27 | Robert Teufl von Fernland | | Zinovia | 2,976 |  | gr |
| 16 Apr 1917 | UB 36 | Harald von Keyserlingk | | Marden | 297 |  | br |
| 16 Apr 1917 | UB 36 | Harald von Keyserlingk | | Rochester Castle | 102 |  | br |
| 16 Apr 1917 | UB 40 | Hans Howaldt | | Cairndhu | 4,109 |  | br |
| 16 Apr 1917 | UB 40 | Hans Howaldt | | Victoria | 165 |  | br |
| 16 Apr 1917 | UB 42 | Fritz Wernicke | | Rosetta | 86 |  | ag |
| 16 Apr 1917 | UC 37 | Otto Launburg | | Sagres | 2,986 |  | pt |
| 16 Apr 1917 | UC 41 | Kurt Bernis | | Lord Chancellor | 135 |  | br |
| 16 Apr 1917 | UC 51 | Wilhelm Schröder | | Amanda | 232 |  | sw |
| 16 Apr 1917 | UC 51 | Wilhelm Schröder | | Polycarp | 509 |  | nw |
| 16 Apr 1917 | UC 70 | Werner Fürbringer | | Eduard | 476 |  | br |
| 17 Apr 1917 | U 32 | Kurt Hartwig | | Costante | 3,479 |  | it |
| 17 Apr 1917 | U 35 | Lothar von Arnauld de la Perière | | Brisbane River | 4,989 |  | br |
| 17 Apr 1917 | U 35 | Lothar von Arnauld de la Perière | | Corfu | 3,695 |  | br |
| 17 Apr 1917 | U 35 | Lothar von Arnauld de la Perière | | Fernmoor | 3,098 |  | br |
| 17 Apr 1917 | U 55 | Wilhelm Werner | | Cairnhill | 4,981 |  | br |
| 17 Apr 1917 | U 61 | Victor Dieckmann | | Aburi | 3,730 |  | br |
| 17 Apr 1917 | U 67 | Hans Nieland | | Kish | 4,928 |  | br |
| 17 Apr 1917 | U 80 | Alfred von Glasenapp | | Gisella (d.) | 2,502 |  | br |
| 17 Apr 1917 | UB 40 | Hans Howaldt | | Lanfranc | 6,287 |  | br |
| 17 Apr 1917 | UC 21 | Reinhold Saltzwedel | | Donegal | 1,885 |  | br |
| 17 Apr 1917 | UC 41 | Kurt Bernis | | U.s.a. | 182 |  | br |
| 17 Apr 1917 | UC 45 | Hubert Aust | | Bretagne | 1,110 |  | da |
| 17 Apr 1917 | UC 45 | Hubert Aust | | Charles Goodanew | 791 |  | br |
| 17 Apr 1917 | UC 47 | Paul Hundius | | Dantzic | 108 |  | br |
| 17 Apr 1917 | UC 47 | Paul Hundius | | William Shephard | 143 |  | br |
| 17 Apr 1917 | UC 51 | Wilhelm Schröder | | Atalanta (d.) | 1,091 |  | sw |
| 17 Apr 1917 | UC 66 | Herbert Pustkuchen | | Clan Sutherland (d.) | 2,820 |  | br |
| 17 Apr 1917 | UC 70 | Werner Fürbringer | | Nirvana (d.) | 6,021 |  | br |
| 17 Apr 1917 | UC 76 | Wilhelm Barten | | Robert | 1,445 |  | da |
| 17 Apr 1917 | UC 76 | Wilhelm Barten | | Winifredian (d.) | 10,422 |  | br |
| 18 Apr 1917 | U 32 | Kurt Hartwig | | Rinaldo | 4,321 |  | br |
| 18 Apr 1917 | U 35 | Lothar von Arnauld de la Perière | | Trekieve | 3,087 |  | br |
| 18 Apr 1917 | U 53 | Hans Rose | | Scalpa | 1,010 |  | br |
| 18 Apr 1917 | U 53 | Hans Rose | | Sculptor | 3,846 |  | br |
| 18 Apr 1917 | U 61 | Victor Dieckmann | | Castilian | 1,923 |  | br |
| 18 Apr 1917 | U 67 | Hans Nieland | | Rhydwen | 4,799 |  | br |
| 18 Apr 1917 | U 84 | Walter Roehr | | Cragoswald | 3,235 |  | br |
| 18 Apr 1917 | U 84 | Walter Roehr | | Rowena | 3,017 |  | br |
| 18 Apr 1917 | U 86 | Friedrich Crüsemann | | Atalanta | 1,091 |  | sw |
| 18 Apr 1917 | U 93 | Edgar von Spiegel von und zu Peckelsheim | | Troldfos | 1,459 |  | nw |
| 18 Apr 1917 | U 93 | Edgar von Spiegel von und zu Peckelsheim | | West Lothian | 1,887 |  | nw |
| 18 Apr 1917 | UB 23 | Hans Ewald Niemer | | Marcel | 24 |  | be |
| 18 Apr 1917 | UC 26 | Matthias Graf von Schmettow | | Surcouf | 195 |  | fr |
| 18 Apr 1917 | UC 27 | Gerhard Schulz | | Thomas | 132 |  | br |
| 18 Apr 1917 | UC 41 | Kurt Bernis | | John S. Boyle | 143 |  | br |
| 18 Apr 1917 | UC 41 | Kurt Bernis | | Ramses | 155 |  | br |
| 18 Apr 1917 | UC 45 | Hubert Aust | | Louisiana | 3,015 |  | da |
| 18 Apr 1917 | UC 50 | Rudolf Seuffer | | Witham | 144 |  | br |
| 18 Apr 1917 | UC 71 | Hans Valentiner | | Heim | 1,669 |  | nw |
| 18 Apr 1917 | UC 76 | Wilhelm Barten | | Bergensgut | 2,029 |  | nw |
| 19 Apr 1917 | U 35 | Lothar von Arnauld de la Perière | | Sowwell | 3,781 |  | br |
| 19 Apr 1917 | U 50 | Gerhard Berger | | Avocet | 1,219 |  | br |
| 19 Apr 1917 | U 53 | Hans Rose | | Tempus | 2,981 |  | br |
| 19 Apr 1917 | U 60 | Karl Georg Schuster | | Howth Head | 4,440 |  | br |
| 19 Apr 1917 | U 78 | Otto Dröscher | | Lobelia | 184 |  | br |
| 19 Apr 1917 | U 84 | Walter Roehr | | Elswick Manor | 3,943 |  | br |
| 19 Apr 1917 | UB 40 | Hans Howaldt | | Limeleaf (d.) | 7,339 |  | br |
| 19 Apr 1917 | UB 41 | Günther Krause | | Ellida | 1,124 |  | nw |
| 19 Apr 1917 | UC 21 | Reinhold Saltzwedel | | Cilurnum | 3,126 |  | br |
| 19 Apr 1917 | UC 26 | Matthias Graf von Schmettow | | Senator Dantziger | 164 |  | br |
| 19 Apr 1917 | UC 44 | Kurt Tebbenjohanns | | Poltava | 945 |  | br |
| 19 Apr 1917 | UC 47 | Paul Hundius | | Gold Coast | 4,255 |  | br |
| 19 Apr 1917 | UC 47 | Paul Hundius | | Jewel | 195 |  | br |
| 19 Apr 1917 | UC 47 | Paul Hundius | | Old Head (d.) | 105 |  | br |
| 19 Apr 1917 | UC 47 | Paul Hundius | | Star Of Freedom | 258 |  | br |
| 19 Apr 1917 | UC 55 | Karl Neureuther | | Bethlehem | 379 |  | br |
| 19 Apr 1917 | UC 6 | Werner von Zerboni di Sposetti | | Lumina (d.) | 5,856 |  | br |
| 20 Apr 1917 | U 35 | Lothar von Arnauld de la Perière | | Leasowe Castle (d.) | 9,737 |  | br |
| 20 Apr 1917 | U 35 | Lothar von Arnauld de la Perière | | Lowdale | 2,260 |  | br |
| 20 Apr 1917 | U 35 | Lothar von Arnauld de la Perière | | Nentmoor | 3,535 |  | br |
| 20 Apr 1917 | U 43 | Hellmuth Jürst | | August | 1,596 |  | ru |
| 20 Apr 1917 | U 43 | Hellmuth Jürst | | San Hilario | 10,157 |  | br |
| 20 Apr 1917 | U 50 | Gerhard Berger | | Emma | 2,520 |  | br |
| 20 Apr 1917 | U 52 | Hans Walther | | Caithness | 3,500 |  | br |
| 20 Apr 1917 | U 52 | Hans Walther | | Senhora Da Conceicao | 206 |  | pt |
| 20 Apr 1917 | U 60 | Karl Georg Schuster | | Torr Head | 5,911 |  | br |
| 20 Apr 1917 | U 67 | Hans Nieland | | Portloe | 3,187 |  | br |
| 20 Apr 1917 | U 69 | Ernst Wilhelms | | Annapolis | 4,567 |  | br |
| 20 Apr 1917 | U 84 | Walter Roehr | | Malakand | 7,653 |  | br |
| 20 Apr 1917 | UB 12 | Ernst Steindorff | | Nepaulin | 314 |  | br |
| 20 Apr 1917 | UB 16 | Hugo Thielmann | | Arie | 107 |  | nl |
| 20 Apr 1917 | UC 16 | Egon von Werner | | Glen (hms) (d.) | 113 |  | br |
| 20 Apr 1917 | UC 21 | Reinhold Saltzwedel | | Georgios | 3,124 |  | gr |
| 20 Apr 1917 | UC 33 | Martin Schelle | | Loch Eye | 225 |  | br |
| 20 Apr 1917 | UC 41 | Kurt Bernis | | Ballochbuie | 921 |  | br |
| 20 Apr 1917 | UC 41 | Kurt Bernis | | Othonna | 180 |  | br |
| 20 Apr 1917 | UC 41 | Kurt Bernis | | Ringholm | 705 |  | nw |
| 20 Apr 1917 | UC 44 | Kurt Tebbenjohanns | | Erith | 168 |  | br |
| 20 Apr 1917 | UC 44 | Kurt Tebbenjohanns | | Grecian | 119 |  | br |
| 20 Apr 1917 | UC 50 | Rudolf Seuffer | | Ruthin Castle | 275 |  | br |
| 21 Apr 1917 | U 32 | Kurt Hartwig | | Giosue | 140 |  | it |
| 21 Apr 1917 | U 50 | Gerhard Berger | | Diadem | 4,307 |  | br |
| 21 Apr 1917 | U 52 | Hans Walther | | Heather (d.) | 1,250 |  | br |
| 21 Apr 1917 | U 53 | Hans Rose | | Pontiac | 1,698 |  | br |
| 21 Apr 1917 | U 61 | Victor Dieckmann | | Skjold | 1,592 |  | nw |
| 21 Apr 1917 | U 61 | Victor Dieckmann | | Telena | 4,778 |  | br |
| 21 Apr 1917 | U 70 | Otto Wünsche | | Sebek | 4,601 |  | br |
| 21 Apr 1917 | UC 21 | Reinhold Saltzwedel | | Emile Et Charlotte | 41 |  | fr |
| 21 Apr 1917 | UC 21 | Reinhold Saltzwedel | | Ville De Dieppe | 1,254 |  | nw |
| 21 Apr 1917 | UC 33 | Martin Schelle | | Jedburgh | 165 |  | br |
| 21 Apr 1917 | UC 33 | Martin Schelle | | Yeovil | 164 |  | br |
| 21 Apr 1917 | UC 37 | Otto Launburg | | Warrior | 3,674 |  | br |
| 21 Apr 1917 | UC 44 | Kurt Tebbenjohanns | | Peik | 701 |  | nw |
| 21 Apr 1917 | UC 55 | Karl Neureuther | | Gerda | 1,600 |  | nw |
| 22 Apr 1917 | U 21 | Otto Hersing | | Giskö | 1,643 |  | nw |
| 22 Apr 1917 | U 21 | Otto Hersing | | Theodore William | 3,057 |  | nw |
| 22 Apr 1917 | U 33 | Gustav Sieß | | Blaatind | 1,641 |  | nw |
| 22 Apr 1917 | U 33 | Gustav Sieß | | Maria S. | 133 |  | it |
| 22 Apr 1917 | U 33 | Gustav Sieß | | Unione | 207 |  | it |
| 22 Apr 1917 | U 43 | Hellmuth Jürst | | Woodward Abrahams | 744 |  | am |
| 22 Apr 1917 | U 53 | Hans Rose | | Neepawah | 1,799 |  | ca |
| 22 Apr 1917 | U 93 | Edgar von Spiegel von und zu Peckelsheim | | Vestlev | 1,729 |  | nw |
| 22 Apr 1917 | UC 21 | Reinhold Saltzwedel | | Capenor | 2,536 |  | br |
| 22 Apr 1917 | UC 21 | Reinhold Saltzwedel | | Percy Birdsall | 1,127 |  | am |
| 22 Apr 1917 | UC 21 | Reinhold Saltzwedel | | Valerie | 2,140 |  | nw |
| 22 Apr 1917 | UC 41 | Kurt Bernis | | Godø | 870 |  | nw |
| 22 Apr 1917 | UC 44 | Kurt Tebbenjohanns | | Nightingale | 91 |  | br |
| 22 Apr 1917 | UC 47 | Paul Hundius | | Gaelic (hms - Q.22) (d.) | 224 |  | br |
| 22 Apr 1917 | UC 66 | Herbert Pustkuchen | | Arethusa | 1,279 |  | br |
| 23 Apr 1917 | U 35 | Lothar von Arnauld de la Perière | | Bandiera E Moro | 2,086 |  | it |
| 23 Apr 1917 | U 50 | Gerhard Berger | | Dykland | 4,291 |  | br |
| 23 Apr 1917 | U 50 | Gerhard Berger | | Oswald | 5,185 |  | br |
| 23 Apr 1917 | U 52 | Hans Walther | | Acadia | 1,556 |  | nw |
| 23 Apr 1917 | U 53 | Hans Rose | | Eptapyrgion | 4,307 |  | br |
| 23 Apr 1917 | U 60 | Karl Georg Schuster | | Svanen | 1,807 |  | da |
| 23 Apr 1917 | U 61 | Victor Dieckmann | | Calluna | 1,405 |  | da |
| 23 Apr 1917 | U 61 | Victor Dieckmann | | Lena | 2,463 |  | br |
| 23 Apr 1917 | U 82 | Hans Adam | | Marita | 1,759 |  | nw |
| 23 Apr 1917 | UB 42 | Fritz Wernicke | | Boro | 15 |  | it |
| 23 Apr 1917 | UC 36 | Gustav Buch | | Savio | 1,922 |  | it |
| 23 Apr 1917 | UC 41 | Kurt Bernis | | Stegg | 463 |  | nw |
| 23 Apr 1917 | UC 44 | Kurt Tebbenjohanns | | Auriac | 871 |  | br |
| 23 Apr 1917 | UC 44 | Kurt Tebbenjohanns | | Baron Stjernblad | 991 |  | da |
| 23 Apr 1917 | UC 44 | Kurt Tebbenjohanns | | Scot | 1,564 |  | da |
| 23 Apr 1917 | UC 47 | Paul Hundius | | Imataka | 1,776 |  | br |
| 23 Apr 1917 | UC 47 | Paul Hundius | | Tommi (d.) | 138 |  | br |
| 23 Apr 1917 | UC 66 | Herbert Pustkuchen | | Rose Ii | 213 |  | br |
| 23 Apr 1917 | UC 71 | Hans Valentiner | | Cenobic | 16 |  | be |
| 23 Apr 1917 | UC 79 | Erich Haecker | | Ydun (p.) | 645 |  | da |
| 24 Apr 1917 | U 35 | Lothar von Arnauld de la Perière | | Bien Aime Prof. Luigi | 265 |  | it |
| 24 Apr 1917 | U 35 | Lothar von Arnauld de la Perière | | Nordsøen | 1,055 |  | da |
| 24 Apr 1917 | U 35 | Lothar von Arnauld de la Perière | | Torvore | 1,667 |  | nw |
| 24 Apr 1917 | U 35 | Lothar von Arnauld de la Perière | | Vilhelm Krag | 3,715 |  | nw |
| 24 Apr 1917 | U 43 | Hellmuth Jürst | | Cordelia | 613 |  | sw |
| 24 Apr 1917 | U 53 | Hans Rose | | Anglesea | 4,534 |  | br |
| 24 Apr 1917 | U 53 | Hans Rose | | Ferndene | 3,770 |  | br |
| 24 Apr 1917 | U 61 | Victor Dieckmann | | Metropolis | 1,811 |  | nw |
| 24 Apr 1917 | U 61 | Victor Dieckmann | | Thirlby (d.) | 2,009 |  | br |
| 24 Apr 1917 | U 70 | Otto Wünsche | | Clan Galbraith | 2,168 |  | nw |
| 24 Apr 1917 | U 70 | Otto Wünsche | | Eos | 179 |  | da |
| 24 Apr 1917 | U 70 | Otto Wünsche | | Valkyrian | 233 |  | sw |
| 24 Apr 1917 | U 70 | Otto Wünsche | | Vestdal | 1,690 |  | nw |
| 24 Apr 1917 | U 81 | Raimund Weisbach | | Amulree | 1,145 |  | br |
| 24 Apr 1917 | U 82 | Hans Adam | | Thistleard | 4,136 |  | br |
| 24 Apr 1917 | UB 10 | Erich von Rohrscheidt | | Minister Tak Van Poortvliet | 1,106 |  | nl |
| 24 Apr 1917 | UB 32 | Max Viebeg | | Marie Blanche | 359 |  | fr |
| 24 Apr 1917 | UC 21 | Reinhold Saltzwedel | | Barnton | 1,858 |  | br |
| 24 Apr 1917 | UC 29 | Ernst Rosenow | | Upton Castle | 145 |  | br |
| 24 Apr 1917 | UC 36 | Gustav Buch | | Kenilworth | 2,735 |  | br |
| 24 Apr 1917 | UC 47 | Paul Hundius | | Heather | 58 |  | br |
| 24 Apr 1917 | UC 47 | Paul Hundius | | Plutus | 1,189 |  | br |
| 24 Apr 1917 | UC 50 | Rudolf Seuffer | | Margate | 162 |  | br |
| 24 Apr 1917 | UC 50 | Rudolf Seuffer | | Mayfly | 199 |  | br |
| 24 Apr 1917 | UC 79 | Erich Haecker | | Harald Haarfager (p.) | 475 |  | nw |
| 25 Apr 1917 | U 43 | Hellmuth Jürst | | Abosso | 7,782 |  | br |
| 25 Apr 1917 | U 50 | Gerhard Berger | | Swanmore | 6,373 |  | br |
| 25 Apr 1917 | U 53 | Hans Rose | | Elisabeth (d.) | 217 |  | da |
| 25 Apr 1917 | U 53 | Hans Rose | | Laura | 335 |  | br |
| 25 Apr 1917 | U 58 | Kurt Wippern | | Havila | 1,421 |  | da |
| 25 Apr 1917 | U 58 | Kurt Wippern | | Hawthornbank | 1,369 |  | da |
| 25 Apr 1917 | U 58 | Kurt Wippern | | Sokoto | 2,259 |  | da |
| 25 Apr 1917 | U 69 | Ernst Wilhelms | | Hesperides | 3,393 |  | br |
| 25 Apr 1917 | U 81 | Raimund Weisbach | | Glenesk | 1,369 |  | nw |
| 25 Apr 1917 | U 81 | Raimund Weisbach | | Heathfield | 1,643 |  | br |
| 25 Apr 1917 | U 81 | Raimund Weisbach | | Invermay | 1,471 |  | br |
| 25 Apr 1917 | U 82 | Hans Adam | | Hackensack | 4,060 |  | br |
| 25 Apr 1917 | UB 10 | Erich von Rohrscheidt | | Elizabeth | 147 |  | nl |
| 25 Apr 1917 | UB 32 | Max Viebeg | | Ballarat | 11,120 |  | br |
| 25 Apr 1917 | UB 34 | Ludwig Schaafhausen | | Este | 1,420 |  | da |
| 25 Apr 1917 | UC 21 | Reinhold Saltzwedel | | Baigorry | 2,161 |  | fr |
| 25 Apr 1917 | UC 36 | Gustav Buch | | Hirondelle | 1,648 |  | br |
| 25 Apr 1917 | UC 36 | Gustav Buch | | La Providence | 272 |  | fr |
| 26 Apr 1917 | U 33 | Gustav Sieß | | Monitor | 138 |  | br |
| 26 Apr 1917 | U 43 | Hellmuth Jürst | | Ehrglis | 238 |  | ru |
| 26 Apr 1917 | U 43 | Hellmuth Jürst | | Hektoria | 5,002 |  | nw |
| 26 Apr 1917 | U 53 | Hans Rose | | Hekla | 169 |  | da |
| 26 Apr 1917 | U 69 | Ernst Wilhelms | | Rio Lages | 3,591 |  | br |
| 26 Apr 1917 | U 69 | Ernst Wilhelms | | Vauxhall | 3,629 |  | br |
| 26 Apr 1917 | U 70 | Otto Wünsche | | Harflete | 4,814 |  | br |
| 26 Apr 1917 | UB 12 | Ernst Steindorff | | Alhama | 1,744 |  | br |
| 26 Apr 1917 | UB 16 | Kurt Siewert | | Kongsli (d.) | 5,822 |  | nw |
| 26 Apr 1917 | UB 38 | Wilhelm Amberger | | Kong Oscar Ii | 842 |  | nw |
| 26 Apr 1917 | UC 11 | Benno von Ditfurth | | Mercury (d.) | 378 |  | br |
| 26 Apr 1917 | UC 21 | Reinhold Saltzwedel | | Boy Denis | 41 |  | br |
| 26 Apr 1917 | UC 27 | Gerhard Schulz | | Augusta | 686 |  | it |
| 26 Apr 1917 | UC 27 | Gerhard Schulz | | Gennarino | 248 |  | it |
| 26 Apr 1917 | UC 41 | Kurt Bernis | | Repro | 230 |  | br |
| 26 Apr 1917 | UC 47 | Paul Hundius | | Aigle | 172 |  | fr |
| 26 Apr 1917 | UC 47 | Paul Hundius | | John Lockett | 842 |  | nw |
| 26 Apr 1917 | UC 50 | Rudolf Seuffer | | Active | 149 |  | br |
| 26 Apr 1917 | UC 50 | Rudolf Seuffer | | Telefon | 777 |  | nw |
| 26 Apr 1917 | UC 63 | Karsten von Heydebreck | | Amsteldjik | 186 |  | nl |
| 26 Apr 1917 | UC 65 | Otto Steinbrinck | | Agnes Cairns | 146 |  | br |
| 26 Apr 1917 | UC 65 | Otto Steinbrinck | | Athole | 150 |  | br |
| 26 Apr 1917 | UC 65 | Otto Steinbrinck | | Bretagne Et Vendee | 79 |  | fr |
| 26 Apr 1917 | UC 67 | Karl Neumann | | Chertsey | 3,264 |  | br |
| 26 Apr 1917 | UC 72 | Ernst Voigt | | Good Hope | 97 |  | br |
| 26 Apr 1917 | UC 72 | Ernst Voigt | | Plantin | 84 |  | br |
| 27 Apr 1917 | U 33 | Gustav Sieß | | Mafalda | 162 |  | it |
| 27 Apr 1917 | U 33 | Gustav Sieß | | Margaret B. Rouss | 701 |  | am |
| 27 Apr 1917 | U 35 | Lothar von Arnauld de la Perière | | Triana (d.) | 748 |  | sp |
| 27 Apr 1917 | U 58 | Kurt Wippern | | Dromore | 4,398 |  | br |
| 27 Apr 1917 | U 58 | Kurt Wippern | | Langfond | 1,097 |  | nw |
| 27 Apr 1917 | U 62 | Ernst Hashagen | | Dunmore Head | 2,293 |  | br |
| 27 Apr 1917 | U 62 | Ernst Hashagen | | Inveramsay | 1,438 |  | br |
| 27 Apr 1917 | U 70 | Otto Wünsche | | Manchester Citizen | 4,251 |  | br |
| 27 Apr 1917 | U 81 | Raimund Weisbach | | Uranus | 3,978 |  | it |
| 27 Apr 1917 | UB 32 | Max Viebeg | | Alfalfa | 2,993 |  | br |
| 27 Apr 1917 | UB 32 | Max Viebeg | | Beemah | 4,750 |  | br |
| 27 Apr 1917 | UB 38 | Wilhelm Amberger | | Jessie | 108 |  | br |
| 27 Apr 1917 | UC 11 | Benno von Ditfurth | | Agile | 246 |  | br |
| 27 Apr 1917 | UC 29 | Ernst Rosenow | | Nidelven | 1,262 |  | nw |
| 27 Apr 1917 | UC 29 | Ernst Rosenow | | Ragnhild | 1,117 |  | nw |
| 27 Apr 1917 | UC 36 | Gustav Buch | | Verjø | 1,002 |  | nw |
| 27 Apr 1917 | UC 48 | Kurt Ramien | | Amelia And Jane (d.) | 62 |  | br |
| 27 Apr 1917 | UC 65 | Otto Steinbrinck | | Burrowa | 2,902 |  | br |
| 27 Apr 1917 | UC 66 | Herbert Pustkuchen | | Quantock (d.) | 4,470 |  | br |
| 27 Apr 1917 | UC 67 | Karl Neumann | | Glencluny | 4,812 |  | br |
| 27 Apr 1917 | UC 67 | Karl Neumann | | Karuma | 2,995 |  | br |
| 28 Apr 1917 | U 33 | Gustav Sieß | | Lisetta | 40 |  | it |
| 28 Apr 1917 | U 44 | Paul Wagenführ | | Vacuum | 2,551 |  | am |
| 28 Apr 1917 | U 45 | Erich Sittenfeld | | Olga | 1,672 |  | ru |
| 28 Apr 1917 | U 58 | Kurt Wippern | | Bullmouth | 4,018 |  | br |
| 28 Apr 1917 | U 63 | Otto Schultze | | Carmelo Padre | 74 |  | it |
| 28 Apr 1917 | U 63 | Otto Schultze | | Giuseppe Padre I | 102 |  | it |
| 28 Apr 1917 | U 63 | Otto Schultze | | Giuseppina G. | 100 |  | it |
| 28 Apr 1917 | U 63 | Otto Schultze | | I Due Fratelli P. | 100 |  | it |
| 28 Apr 1917 | U 63 | Otto Schultze | | Karonga | 4,665 |  | br |
| 28 Apr 1917 | U 63 | Otto Schultze | | Natale B. | 55 |  | it |
| 28 Apr 1917 | U 63 | Otto Schultze | | San Francesco Di Paola | 41 |  | it |
| 28 Apr 1917 | U 67 | Hans Nieland | | Port Jackson | 2,309 |  | br |
| 28 Apr 1917 | U 70 | Otto Wünsche | | Anne Marie | 441 |  | nw |
| 28 Apr 1917 | U 81 | Raimund Weisbach | | Jose De Larrinaga | 5,017 |  | br |
| 28 Apr 1917 | U 81 | Raimund Weisbach | | Terence | 4,309 |  | br |
| 28 Apr 1917 | U 93 | Edgar von Spiegel von und zu Peckelsheim | | Diana (d.) | 207 |  | da |
| 28 Apr 1917 | k.u.k. U14 | Georg Ritter von Trapp | | Teakwood | 5,315 |  | br |
| 28 Apr 1917 | UB 31 | Thomas Bieber | | Medina | 12,350 |  | br |
| 28 Apr 1917 | UB 32 | Max Viebeg | | Pursue | 37 |  | br |
| 28 Apr 1917 | UC 25 | Johannes Feldkirchner | | Juliette | 50 |  | fr |
| 28 Apr 1917 | UC 36 | Gustav Buch | | Condor | 3,565 |  | ru |
| 28 Apr 1917 | UC 37 | Otto Launburg | | Niobe | 66 |  | it |
| 28 Apr 1917 | UC 65 | Otto Steinbrinck | | Alu Mendi | 2,104 |  | sp |
| 28 Apr 1917 | UC 74 | Wilhelm Marschall | | Pontiac | 3,345 |  | br |
| 28 Apr 1917 | UC 79 | Erich Haecker | | Laura (p.) | 787 |  | da |
| 28 Apr 1917 | UC 79 | Erich Haecker | | Storebelt (p.) | 599 |  | da |
| 29 Apr 1917 | U 21 | Otto Hersing | | Askepot | 1,793 |  | nw |
| 29 Apr 1917 | U 70 | Otto Wünsche | | Daleby | 3,628 |  | br |
| 29 Apr 1917 | U 93 | Edgar von Spiegel von und zu Peckelsheim | | Comedian | 4,889 |  | br |
| 29 Apr 1917 | U 93 | Edgar von Spiegel von und zu Peckelsheim | | Ikbal | 5,434 |  | br |
| 29 Apr 1917 | UB 21 | Franz Walther | | Victoria | 1,620 |  | br |
| 29 Apr 1917 | UB 22 | Karl Wacker | | Dilston Castle | 129 |  | br |
| 29 Apr 1917 | UB 32 | Max Viebeg | | Ellen Harrison | 103 |  | br |
| 29 Apr 1917 | UB 32 | Max Viebeg | | Mermaid | 76 |  | br |
| 29 Apr 1917 | UC 29 | Ernst Rosenow | | Carbo I | 1,385 |  | da |
| 29 Apr 1917 | UC 37 | Otto Launburg | | Giuseppe Maria | 99 |  | it |
| 29 Apr 1917 | UC 72 | Ernst Voigt | | Bayonnais | 20 |  | fr |
| 29 Apr 1917 | UC 72 | Ernst Voigt | | Eugenie Et Lucie | 34 |  | fr |
| 29 Apr 1917 | UC 72 | Ernst Voigt | | Frere Des Cinq Soeurs | 20 |  | fr |
| 29 Apr 1917 | UC 72 | Ernst Voigt | | Petit Ernest | 20 |  | fr |
| 30 Apr 1917 | U 21 | Otto Hersing | | Borrowdale | 1,268 |  | ru |
| 30 Apr 1917 | U 33 | Gustav Sieß | | Chrisomalli Th. Sifneo | 2,415 |  | gr |
| 30 Apr 1917 | U 61 | Victor Dieckmann | | Jarstein | 198 |  | nw |
| 30 Apr 1917 | U 62 | Ernst Hashagen | | Fortunata | 3,348 |  | it |
| 30 Apr 1917 | U 62 | Ernst Hashagen | | Tulip | 1,250 |  | br |
| 30 Apr 1917 | U 70 | Otto Wünsche | | Delamere | 1,525 |  | br |
| 30 Apr 1917 | U 81 | Raimund Weisbach | | Elisabeth | 217 |  | da |
| 30 Apr 1917 | U 93 | Edgar von Spiegel von und zu Peckelsheim | | Ascaro | 3,245 |  | it |
| 30 Apr 1917 | U 93 | Edgar von Spiegel von und zu Peckelsheim | | Horsa | 2,949 |  | br |
| 30 Apr 1917 | U 93 | Edgar von Spiegel von und zu Peckelsheim | | Parthenon | 2,934 |  | gr |
| 30 Apr 1917 | UB 22 | Karl Wacker | | Argo | 131 |  | br |
| 30 Apr 1917 | UB 32 | Max Viebeg | | Portbail | 378 |  | fr |
| 30 Apr 1917 | UC 37 | Otto Launburg | | Colbert | 5,394 |  | fr |
| 30 Apr 1917 | UC 61 | Georg Gerth | | Arfon | 227 |  | br |
| 30 Apr 1917 | UC 61 | Georg Gerth | | Gorizia | 1,957 |  | ur |
| 30 Apr 1917 | UC 61 | Georg Gerth | | Little Mystery | 114 |  | br |
| 30 Apr 1917 | UC 70 | Werner Fürbringer | | Eden | 1,304 |  | nw |
|
| 1,015,379 | | | 473 ships sunk (888,458 tons) and 36 ships damaged (126,921 tons). Legend (d.) means the ship was damaged. (p.) means the ship was taken as prize (included in ships & tonnage lost).
We have a picture of this vessel.
|