May 1917
This is the full listing of all ships hit during May 1917. You can click on any of the links for further information on either ship, U-boat, commander or convoy.
| Date | U-boat | Commander | | Name of ship | Tons | Nat. |
| |
| 1 May 1917 | U 69 | Ernst Wilhelms | | Rockingham | 4,555 |  | am |
| 1 May 1917 | U 81 | Raimund Weisbach | | Dorie (d.) | 3,264 |  | br |
| 1 May 1917 | U 81 | Raimund Weisbach | | San Urbano | 6,458 | | br |
| 1 May 1917 | UB 18 | Claus Lafrenz | | C. A. Jaques | 2,105 | | br |
| 1 May 1917 | UB 38 | Wilhelm Amberger | | Ladywood | 2,314 | | br |
| 1 May 1917 | UB 43 | Horst Obermüller | | British Sun | 5,565 | | br |
| 1 May 1917 | UC 29 | Ernst Rosenow | | Firelight | 1,143 | | br |
| 1 May 1917 | UC 48 | Kurt Ramien | | Raymond Ester | 20 |  | fr |
| 1 May 1917 | UC 65 | Otto Steinbrinck | | Helen | 322 | | br |
| 1 May 1917 | UC 65 | Otto Steinbrinck | | Ivrig | 1,197 |  | nw |
| 1 May 1917 | UC 65 | Otto Steinbrinck | | W. D. Potts | 112 | | br |
| 1 May 1917 | UC 66 | Herbert Pustkuchen | | Bagdale | 3,045 | | br |
| 1 May 1917 | UC 66 | Herbert Pustkuchen | | John W. Pearn | 76 | | br |
| 1 May 1917 | UC 66 | Herbert Pustkuchen | | La Manche | 335 | | fr |
| 1 May 1917 | UC 69 | Erwin Waßner | | Barreiro | 1,738 |  | pt |
| 1 May 1917 | UC 72 | Ernst Voigt | | Acacia | 9 | | fr |
| 1 May 1917 | UC 72 | Ernst Voigt | | Antigone | 15 | | fr |
| 1 May 1917 | UC 72 | Ernst Voigt | | Camille Amelie | 21 | | fr |
| 1 May 1917 | UC 73 | Kurt Schapler |  | Imberhorne | 2,042 |  | fi |
| 1 May 1917 | UC 75 | Johannes Lohs | | Alide | 175 |  | ru |
| 2 May 1917 | U 44 | Paul Wagenführ | | Natuna | 1,121 | | nw |
| 2 May 1917 | U 58 | Kurt Wippern | | Beeswing | 1,462 | | br |
| 2 May 1917 | U 58 | Kurt Wippern | | Dione | 785 | | nw |
| 2 May 1917 | U 58 | Kurt Wippern | | Vanduara | 2,079 | | nw |
| 2 May 1917 | U 69 | Ernst Wilhelms | | Troilus | 7,625 | | br |
| 2 May 1917 | UB 18 | Claus Lafrenz | | Juno | 1,384 | | br |
| 2 May 1917 | UB 18 | Claus Lafrenz | | Tela | 7,226 | | br |
| 2 May 1917 | UB 21 | Franz Walther | | Rikard Noordrak | 1,123 | | nw |
| 2 May 1917 | UC 26 | Matthias Graf von Schmettow | | Certo | 1,629 | | nw |
| 2 May 1917 | UC 26 | Matthias Graf von Schmettow | | Derwent | 555 | | br |
| 2 May 1917 | UC 37 | Otto Launburg | | Camerata (d.) | 3,723 | | br |
| 2 May 1917 | UC 48 | Kurt Ramien | | United | 61 | | br |
| 2 May 1917 | UC 48 | Kurt Ramien | | Warnow | 1,593 | | br |
| 2 May 1917 | UC 62 | Max Schmitz | | Noordzee | 136 |  | nl |
| 2 May 1917 | UC 65 | Otto Steinbrinck | | Amber | 401 | | br |
| 2 May 1917 | UC 65 | Otto Steinbrinck | | Derrymore | 485 | | br |
| 2 May 1917 | UC 65 | Otto Steinbrinck | | Dora | 296 | | br |
| 2 May 1917 | UC 65 | Otto Steinbrinck | | Earnest | 111 | | br |
| 2 May 1917 | UC 65 | Otto Steinbrinck | | Morion | 299 | | br |
| 2 May 1917 | UC 65 | Otto Steinbrinck | | Saint Mungo | 402 | | br |
| 2 May 1917 | UC 65 | Otto Steinbrinck | | Taizan Maru | 3,527 |  | jp |
| 2 May 1917 | UC 71 | Hugo Thielmann | | Westland | 108 | | nl |
| 2 May 1917 | UC 72 | Ernst Voigt | | Cancalais | 231 | | fr |
| 2 May 1917 | UC 72 | Ernst Voigt | | Keryado | 175 | | fr |
| 2 May 1917 | UC 72 | Ernst Voigt | | Russie | 127 | | fr |
| 2 May 1917 | UC 72 | Ernst Voigt | | Victoire | 290 | | fr |
| 2 May 1917 | UC 72 | Ernst Voigt | | Yvonne | 97 | | fr |
| 2 May 1917 | UC 74 | Wilhelm Marschall | | Alessandria | 8,006 |  | it |
| 3 May 1917 | U 21 | Otto Hersing | | Lindisfarne | 1,703 | | ru |
| 3 May 1917 | U 43 | Hellmuth Jürst | | Concordia (p.) | 173 | | nl |
| 3 May 1917 | U 43 | Hellmuth Jürst | | Emma (p.) | 183 | | nl |
| 3 May 1917 | U 45 | Erich Sittenfeld | | Palm Branch (d.) | 3,891 | | br |
| 3 May 1917 | U 45 | Erich Sittenfeld | | Truvor | 2,462 | | ru |
| 3 May 1917 | U 62 | Ernst Hashagen | | Frederick Knight | 3,604 | | br |
| 3 May 1917 | U 63 | Otto Schultze | | Washington | 5,080 | | br |
| 3 May 1917 | k.u.k. U14 | Georg Ritter von Trapp | | Antonio Sciesa | 1,905 | | it |
| 3 May 1917 | UB 40 | Hans Howaldt | | Clodmoor | 3,753 | | br |
| 3 May 1917 | UC 26 | Matthias Graf von Schmettow | | Ussa | 2,066 | | br |
| 3 May 1917 | UC 49 | Alfred Arnold | | Helge | 162 |  | da |
| 3 May 1917 | UC 61 | Georg Gerth | | Fils Du Progres | 25 | | fr |
| 3 May 1917 | UC 61 | Georg Gerth | | Giovannina | 3,030 | | it |
| 3 May 1917 | UC 69 | Erwin Waßner | | Maria | 2,754 |  | gr |
| 3 May 1917 | UC 69 | Erwin Waßner | | Polstad | 2,692 | | nw |
| 3 May 1917 | UC 73 | Kurt Schapler | | Mezly | 1,568 | | fr |
| 3 May 1917 | UC 73 | Kurt Schapler | | Misurata | 2,691 | | it |
| 3 May 1917 | UC 75 | Johannes Lohs | | Carberry King | 31 | | br |
| 3 May 1917 | UC 75 | Johannes Lohs | | Eleanor | 31 | | br |
| 3 May 1917 | UC 75 | Johannes Lohs | | Fastnet | 31 | | br |
| 3 May 1917 | UC 75 | Johannes Lohs | | Hibernia | 21 | | br |
| 3 May 1917 | UC 75 | Johannes Lohs | | Lucky Lass | 10 | | br |
| 3 May 1917 | UC 75 | Johannes Lohs | | North Star | 15 | | br |
| 3 May 1917 | UC 75 | Johannes Lohs | | Sir Edward Birkbeck | 23 | | br |
| 3 May 1917 | UC 77 | Reinhard von Rabenau | | Glen Tanar | 817 | | br |
| 4 May 1917 | U 34 | Johannes Klasing | | Francesco C. | 984 | | it |
| 4 May 1917 | U 62 | Ernst Hashagen | | Jörgen Olsen (d.) | 310 | | da |
| 4 May 1917 | U 63 | Otto Schultze | | Transylvania | 14,348 | | br |
| 4 May 1917 | U 82 | Hans Adam | | Ellin (d.) | 4,577 | | gr |
| 4 May 1917 | k.u.k. U4 | Rudolf Singule | | Perseo | 4,857 | | it |
| 4 May 1917 | UB 38 | Wilhelm Amberger | | Aghios Nikolaos | 2,231 | | gr |
| 4 May 1917 | UB 38 | Wilhelm Amberger | | Assos | 2,840 | | gr |
| 4 May 1917 | UB 38 | Wilhelm Amberger | | Joseph | 205 | | br |
| 4 May 1917 | UC 34 | Robert Sprenger | | Cameleon | 179 | | fr |
| 4 May 1917 | UC 42 | Otto Heinrich Tornow | | Sophie | 75 | | da |
| 4 May 1917 | UC 51 | Hans Galster | | Marie | 772 | | da |
| 4 May 1917 | UC 62 | Max Schmitz | | Neptunus | 160 | | nl |
| 4 May 1917 | UC 65 | Otto Steinbrinck | | New Design No.2 | 66 | | br |
| 4 May 1917 | UC 65 | Otto Steinbrinck | | Pilar De Larrinaga | 4,136 | | br |
| 4 May 1917 | UC 65 | Otto Steinbrinck | | Strumble | 45 | | br |
| 4 May 1917 | UC 65 | Otto Steinbrinck | | Victorious | 39 | | br |
| 4 May 1917 | UC 69 | Erwin Waßner | | Ilva | 2,140 | | it |
| 4 May 1917 | UC 69 | Erwin Waßner | | Ioannis P. Goulandris | 3,153 | | gr |
| 4 May 1917 | UC 69 | Erwin Waßner | | Tromp | 2,751 | | nw |
| 4 May 1917 | UC 72 | Ernst Voigt | | Mamelena Ix | 115 |  | sp |
| 4 May 1917 | UC 72 | Ernst Voigt | | Mamelena Xii | 111 | | sp |
| 4 May 1917 | UC 72 | Ernst Voigt | | Marne | 250 | | fr |
| 4 May 1917 | UC 72 | Ernst Voigt | | Verdun | 250 | | fr |
| 4 May 1917 | UC 75 | Johannes Lohs | | Marie | 133 | | fr |
| 4 May 1917 | UC 77 | Reinhard von Rabenau | | Herrington | 1,258 | | br |
| 4 May 1917 | UC 77 | Reinhard von Rabenau | | Vale | 720 | | nw |
| 4 May 1917 | UC 77 | Reinhard von Rabenau | | Wolseley (d.) | 159 | | br |
| 5 May 1917 | U 49 | Richard Hartmann | | Snig | 2,115 | | nw |
| 5 May 1917 | U 58 | Kurt Wippern | | Asra | 1,975 | | nw |
| 5 May 1917 | U 63 | Otto Schultze | | Talawa (d.) | 3,834 | | br |
| 5 May 1917 | UB 21 | Franz Walther | | Edith Cavell | 20 | | br |
| 5 May 1917 | UC 33 | Martin Schelle | | Lodes | 396 | | br |
| 5 May 1917 | UC 37 | Otto Launburg | | Dina Di Lozenzo | 127 | | it |
| 5 May 1917 | UC 37 | Otto Launburg | | Harmattan | 4,792 | | br |
| 5 May 1917 | UC 42 | Otto Heinrich Tornow | | Angela | 122 | | br |
| 5 May 1917 | UC 48 | Kurt Ramien | | Feltria | 5,254 | | br |
| 5 May 1917 | UC 48 | Kurt Ramien | | Greta | 297 | | br |
| 5 May 1917 | UC 51 | Hans Galster | | Segovia | 1,394 | | nw |
| 5 May 1917 | UC 61 | Georg Gerth | | Le Gard (d.) | 1,658 | | fr |
| 5 May 1917 | UC 71 | Hugo Thielmann | | Simon | 150 | | nl |
| 5 May 1917 | UC 72 | Ernst Voigt | | Nydal | 1,809 | | nw |
| 5 May 1917 | UC 75 | Johannes Lohs | | Lavender | 1,200 | | br |
| 5 May 1917 | UC 77 | Reinhard von Rabenau | | Odense | 1,756 | | da |
| 6 May 1917 | U 21 | Otto Hersing | | Adansi | 2,644 | | br |
| 6 May 1917 | UB 21 | Franz Walther | | Harold | 1,679 |  | sw |
| 6 May 1917 | UC 31 | Otto von Schrader | | Poseidon I | 98 | | nl |
| 6 May 1917 | UC 42 | Otto Heinrich Tornow | | Hebble | 904 | | br |
| 6 May 1917 | UC 69 | Erwin Waßner | | Gurth | 1,340 | | nw |
| 6 May 1917 | UC 69 | Erwin Waßner | | Voss | 2,390 | | nw |
| 6 May 1917 | UC 72 | Ernst Voigt | | Francesco | 3,438 | | it |
| 6 May 1917 | UC 75 | Johannes Lohs | | President | 354 | | fr |
| 6 May 1917 | UC 77 | Reinhard von Rabenau | | Kaparika | 1,232 | | nw |
| 7 May 1917 | U 62 | Ernst Hashagen | | Polamhall | 4,010 | | br |
| 7 May 1917 | U 63 | Otto Schultze | | Crown Of Leon (d.) | 3,391 | | br |
| 7 May 1917 | U 80 | Alfred von Glasenapp | | H. H. Petersen | 192 | | da |
| 7 May 1917 | U 80 | Alfred von Glasenapp | | Sophie | 237 | | da |
| 7 May 1917 | UB 20 | Hermann Glimpf | | Martha Maria | 176 | | nl |
| 7 May 1917 | UB 20 | Hermann Glimpf | | Prins Hendrik De Nederlande | 182 | | nl |
| 7 May 1917 | UB 43 | Horst Obermüller | | Repton | 2,881 | | br |
| 7 May 1917 | UC 48 | Kurt Ramien | | Kinross | 4,120 | | br |
| 7 May 1917 | UC 49 | Alfred Arnold | | Tore Jarl | 1,256 | | nw |
| 7 May 1917 | UC 65 | Otto Steinbrinck | | Maude | 93 | | br |
| 7 May 1917 | UC 69 | Erwin Waßner | | Leikanger | 3,544 | | nw |
| 7 May 1917 | UC 69 | Erwin Waßner | | Tiger | 3,273 | | nw |
| 7 May 1917 | UC 70 | Werner Fürbringer | | Lowmount | 2,070 | | br |
| 8 May 1917 | U 21 | Otto Hersing | | Killarney | 1,413 | | br |
| 8 May 1917 | U 47 | Heinrich Metzger | | Madeleine Iii (d.) | 149 | | fr |
| 8 May 1917 | U 49 | Richard Hartmann | | Petunia | 1,749 | | br |
| 8 May 1917 | UB 21 | Franz Walther | | Batavier Ii (p.) | 157 | | nl |
| 8 May 1917 | UC 26 | Matthias Graf von Schmettow | | Iris | 75 | | br |
| 8 May 1917 | UC 31 | Otto von Schrader | | Zarefah | 279 | | br |
| 8 May 1917 | UC 61 | Georg Gerth | | Nelly | 1,868 | | fr |
| 8 May 1917 | UC 65 | Otto Steinbrinck | | San Patricio (d.) | 9,712 | | br |
| 9 May 1917 | | | | Madonna Del Paradiso | 10 | | it |
| 9 May 1917 | U 34 | Johannes Klasing | | Harpagus | 5,866 | | br |
| 9 May 1917 | U 80 | Alfred von Glasenapp | | Hans Broge | 1,432 | | da |
| 9 May 1917 | UC 17 | Ralph Wenninger | | Marchiena | 170 | | nl |
| 9 May 1917 | UC 35 | Ernst von Voigt | | Dio Ti Guardi | 11 | | it |
| 9 May 1917 | UC 35 | Ernst von Voigt | | L’oriente | 11 | | it |
| 9 May 1917 | UC 35 | Ernst von Voigt | | Peppino Aiello | 113 | | it |
| 9 May 1917 | UC 35 | Ernst von Voigt | | San Pietro | 11 | | it |
| 9 May 1917 | UC 42 | Otto Heinrich Tornow | | Kitty | 181 | | br |
| 9 May 1917 | UC 49 | Alfred Arnold | | Windward Ho | 226 | | br |
| 10 May 1917 | U 34 | Johannes Klasing | | Carmen | 319 | | sp |
| 10 May 1917 | U 62 | Ernst Hashagen | | Berangere | 2,851 | | fr |
| 10 May 1917 | U 62 | Ernst Hashagen | | Gazelle | 288 | | nw |
| 10 May 1917 | UC 17 | Ralph Wenninger | | Veni | 654 | | nw |
| 10 May 1917 | UC 35 | Ernst von Voigt | | Leone Xiii | 78 | | it |
| 10 May 1917 | UC 40 | Gustav Deuerlich | | Lord Ridley | 215 | | br |
| 10 May 1917 | UC 61 | Georg Gerth | | Broomhill | 1,392 | | br |
| 10 May 1917 | UC 61 | Georg Gerth | | Minerva | 518 | | nw |
| 10 May 1917 | UC 63 | Karsten von Heydebreck | | Gruno | 171 | | nl |
| 11 May 1917 | | | | Carolina | 86 | | it |
| 11 May 1917 | U 34 | Johannes Klasing | | Lefkosia | 1,087 | | gr |
| 11 May 1917 | U 34 | Johannes Klasing | | Medjerda | 1,918 | | fr |
| 11 May 1917 | U 45 | Erich Sittenfeld | | Hermes | 3,579 | | ru |
| 11 May 1917 | U 47 | Heinrich Metzger | | Hindoo (d.) | 4,915 | | br |
| 11 May 1917 | U 49 | Richard Hartmann | | Barrister | 3,679 | | br |
| 11 May 1917 | U 80 | Alfred von Glasenapp | | Anna Alwina | 364 | | ru |
| 11 May 1917 | U 80 | Alfred von Glasenapp | | Calchas | 6,748 | | br |
| 11 May 1917 | UB 18 | Claus Lafrenz | | Tarpeia | 538 | | br |
| 11 May 1917 | UC 1 | Walter Warzecha | | Bracklyn | 303 | | br |
| 11 May 1917 | UC 35 | Ernst von Voigt | | Limassol | 100 | | br |
| 11 May 1917 | UC 35 | Ernst von Voigt | | Luisa Madre | 87 | | it |
| 11 May 1917 | UC 35 | Ernst von Voigt | | Maddalena Madre | 87 | | it |
| 11 May 1917 | UC 35 | Ernst von Voigt | | Rosalia Madre | 95 | | it |
| 11 May 1917 | UC 35 | Ernst von Voigt | | San Antonio | 40 | | it |
| 12 May 1917 | U 19 | Johannes Spieß | | Wirral | 4,207 | | br |
| 12 May 1917 | U 32 | Kurt Hartwig | | Locksley Hall | 3,635 | | br |
| 12 May 1917 | U 34 | Johannes Klasing | | Zanoni | 3,851 | | br |
| 12 May 1917 | U 38 | Max Valentiner | | Egyptian Prince | 3,117 | | br |
| 12 May 1917 | U 48 | Karl Edeling | | San Onofre | 9,717 | | br |
| 12 May 1917 | U 57 | Carl-Siegfried Ritter von Georg | | Refugio | 2,642 | | br |
| 12 May 1917 | UC 17 | Ralph Wenninger | | G.L.C. | 24 | | br |
| 12 May 1917 | UC 17 | Ralph Wenninger | | Galicia | 5,922 | | br |
| 12 May 1917 | UC 6 | Werner von Zerboni di Sposetti | | Waterville (d.) | 1,968 | | br |
| 13 May 1917 | U 38 | Max Valentiner | | Rio Amazonas | 2,970 | | it |
| 13 May 1917 | U 47 | Heinrich Metzger | | L’indipendente F. | 181 | | it |
| 13 May 1917 | U 48 | Karl Edeling | | Jessmore | 3,911 | | br |
| 13 May 1917 | UC 17 | Ralph Wenninger | | Anna | 610 | | da |
| 13 May 1917 | UC 17 | Ralph Wenninger | | Hudson | 817 | | nw |
| 14 May 1917 | U 34 | Johannes Klasing | | Gravelinoise | 129 | | fr |
| 14 May 1917 | U 34 | Johannes Klasing | | Tejo | 201 | | pt |
| 14 May 1917 | U 49 | Richard Hartmann | | Carnmoney | 1,299 | | br |
| 14 May 1917 | U 57 | Carl-Siegfried Ritter von Georg | | Arlington Court (d.) | 4,346 | | br |
| 14 May 1917 | U 63 | Otto Schultze | | Francesco Raiola | 181 | | it |
| 14 May 1917 | U 63 | Otto Schultze | | Volga (d.) | 4,404 | | br |
| 14 May 1917 | UB 18 | Claus Lafrenz | | Elizabeth Hampton | 108 | | br |
| 14 May 1917 | UC 17 | Ralph Wenninger | | Farley | 3,692 | | br |
| 14 May 1917 | UC 49 | Alfred Arnold | | Bel Lily | 168 | | br |
| 15 May 1917 | U 34 | Johannes Klasing | | Tung Shan | 3,999 | | br |
| 15 May 1917 | U 46 | Leo Hillebrand | | Grosholm | 1,847 | | nw |
| 15 May 1917 | U 47 | Heinrich Metzger | | Pancras (d.) | 4,436 | | br |
| 15 May 1917 | U 48 | Karl Edeling | | Meuse | 4,075 | | fr |
| 15 May 1917 | U 63 | Otto Schultze | | Ferrara (d.) | 5,660 | | it |
| 15 May 1917 | UB 18 | Claus Lafrenz | | Panaghi Lykiardopoulo | 3,193 | | gr |
| 15 May 1917 | UB 40 | Hans Howaldt | | Cuba | 271 | | br |
| 15 May 1917 | UC 25 | Johannes Feldkirchner | | Boutefeu | 703 | | fr |
| 15 May 1917 | UC 71 | Hugo Thielmann | | Boreas | 192 | | nl |
| 15 May 1917 | UC 75 | Johannes Lohs | | Polymnia | 2,426 | | br |
| 15 May 1917 | UC 79 | Erich Haecker | | Ellen (p.) | 786 | | da |
| 16 May 1917 | U 30 | Franz Grünert | | Middlesex | 7,265 | | br |
| 16 May 1917 | U 34 | Johannes Klasing | | Dorothy Duff | 186 | | br |
| 16 May 1917 | U 34 | Johannes Klasing | | Patricio (d.) | 2,164 | | sp |
| 16 May 1917 | UB 20 | Hermann Glimpf | | Friso | 17 | | nl |
| 16 May 1917 | UB 40 | Hans Howaldt | | Highland Corrie | 7,583 | | br |
| 16 May 1917 | UB 40 | Hans Howaldt | | Pagenturm | 5,000 | | br |
| 16 May 1917 | UC 17 | Ralph Wenninger | | L’hermite (d.) | 2,189 | | fr |
| 16 May 1917 | UC 25 | Johannes Feldkirchner | | Dartmouth (d.) | 5,250 | | br |
| 16 May 1917 | UC 35 | Ernst von Voigt | | Hilonian | 2,921 | | am |
| 16 May 1917 | UC 71 | Hugo Thielmann | | Hendrika Johana | 134 | | nl |
| 16 May 1917 | UC 79 | Erich Haecker | | Thorunn (p.) | 990 | | nw |
| 17 May 1917 | U 19 | Johannes Spieß | | Vesterland | 3,832 | | sw |
| 17 May 1917 | U 34 | Johannes Klasing | | Alfonso | 230 | | it |
| 17 May 1917 | U 46 | Leo Hillebrand | | Lewisham | 2,810 | | br |
| 17 May 1917 | U 47 | Heinrich Metzger | | Eirini | 2,662 | | gr |
| 17 May 1917 | U 48 | Karl Edeling | | Margareta | 1,873 | | ru |
| 17 May 1917 | U 49 | Richard Hartmann | | George Pyman | 3,859 | | br |
| 17 May 1917 | UB 20 | Hermann Glimpf | | Kilmaho | 2,155 | | br |
| 17 May 1917 | UB 40 | Hans Howaldt | | Florence Louisa | 115 | | br |
| 17 May 1917 | UC 31 | Otto von Schrader | | Aspen (d.) | 3,103 | | sw |
| 17 May 1917 | UC 31 | Otto von Schrader | | Viken | 1,825 | | sw |
| 17 May 1917 | UC 71 | Hugo Thielmann | | Jakoba | 107 | | nl |
| 17 May 1917 | UC 71 | Hugo Thielmann | | Mercurius | 80 | | nl |
| 17 May 1917 | UC 79 | Erich Haecker | | Alexander Shukoff (p.) | 1,652 | | da |
| 18 May 1917 | U 46 | Leo Hillebrand | | Llandrindod | 3,841 | | br |
| 18 May 1917 | U 46 | Leo Hillebrand | | Penhale | 3,712 | | br |
| 18 May 1917 | U 47 | Heinrich Metzger | | Frances M. | 1,228 | | am |
| 18 May 1917 | UB 20 | Hermann Glimpf | | Adventure | 50 | | br |
| 18 May 1917 | UB 20 | Hermann Glimpf | | Primrose | 62 | | br |
| 18 May 1917 | UC 20 | Hans Adalbert von der Lühe | | Millicent Knight | 3,563 | | br |
| 18 May 1917 | UC 36 | Gustav Buch | | Camberwell | 4,078 | | br |
| 18 May 1917 | UC 36 | Gustav Buch | | Elford | 1,739 | | br |
| 18 May 1917 | UC 36 | Gustav Buch | | Lucknow | 171 | | br |
| 18 May 1917 | UC 47 | Paul Hundius | | Mary Baird | 1,830 | | br |
| 18 May 1917 | UC 70 | Werner Fürbringer | | C.E.C.G. | 47 | | br |
| 18 May 1917 | UC 70 | Werner Fürbringer | | Dromore | 268 | | br |
| 18 May 1917 | UC 71 | Hugo Thielmann | | Annetta | 177 | | nl |
| 18 May 1917 | UC 79 | Erich Haecker | | Magnus (p.) | 1,297 | | da |
| 19 May 1917 | U 34 | Johannes Klasing | | Mardinian | 3,322 | | br |
| 19 May 1917 | U 45 | Erich Sittenfeld | | Elise | 137 | | da |
| 19 May 1917 | U 57 | Carl-Siegfried Ritter von Georg | | Farnham | 3,102 | | br |
| 19 May 1917 | k.u.k. U29 | Leo Prásil | | Mordenwood | 3,125 | | br |
| 19 May 1917 | UB 20 | Hermann Glimpf | | Askild | 2,540 | | nw |
| 19 May 1917 | UC 17 | Ralph Wenninger | | Kumu (d.) | 315 | | br |
| 19 May 1917 | UC 58 | Karl Vesper | | Erik | 785 | | sw |
| 19 May 1917 | UC 58 | Karl Vesper | | Göta (p.) | 1,128 | | sw |
| 19 May 1917 | UC 58 | Karl Vesper | | Kjell | 235 | | sw |
| 19 May 1917 | UC 58 | Karl Vesper | | Kyros | 221 | | sw |
| 19 May 1917 | UC 58 | Karl Vesper | | Lizzie (p.) | 1,095 | | sw |
| 19 May 1917 | UC 58 | Karl Vesper | | Märta (p.) | 493 | | sw |
| 19 May 1917 | UC 58 | Karl Vesper | | Olga | 83 | | sw |
| 19 May 1917 | UC 58 | Karl Vesper | | Pauline | 168 | | sw |
| 19 May 1917 | UC 58 | Karl Vesper | | Therese | 208 | | sw |
| 20 May 1917 | U 19 | Johannes Spieß | | Arnfinn Jarl | 1,097 | | nw |
| 20 May 1917 | U 34 | Johannes Klasing | | Caspian | 3,606 | | br |
| 20 May 1917 | U 46 | Leo Hillebrand | | Lady Patricia | 1,372 | | br |
| 20 May 1917 | UB 20 | Hermann Glimpf | | Normand | 2,097 | | nw |
| 20 May 1917 | UB 40 | Hans Howaldt | | Porthkerry | 1,920 | | br |
| 20 May 1917 | UB 40 | Hans Howaldt | | Tycho | 3,216 | | br |
| 20 May 1917 | UC 36 | Gustav Buch | | Dana | 182 | | br |
| 20 May 1917 | UC 36 | Gustav Buch | | Mientji | 120 | | br |
| 20 May 1917 | UC 36 | Gustav Buch | | Tijuca | 2,304 |  | bz |
| 20 May 1917 | UC 64 | Ernst Müller-Schwarz | | Voorwaarts | 114 | | nl |
| 20 May 1917 | UC 79 | Erich Haecker | | Otto (p.) | 152 | | da |
| 20 May 1917 | UC 79 | Erich Haecker | | Pomona (p.) | 789 | | nl |
| 21 May 1917 | U 34 | Johannes Klasing | | Saint Michel | 175 | | fr |
| 21 May 1917 | U 48 | Karl Edeling | | Lynton | 2,531 | | ru |
| 21 May 1917 | U 48 | Karl Edeling | | Madura | 1,096 | | nw |
| 21 May 1917 | U 65 | Hermann von Fischel | | Ampleforth | 3,873 | | br |
| 21 May 1917 | U 65 | Hermann von Fischel | | Don Diego | 3,632 | | br |
| 21 May 1917 | U 80 | Alfred von Glasenapp | | Senator | 211 | | br |
| 21 May 1917 | UB 31 | Thomas Bieber | | City Of Corinth | 5,870 | | br |
| 21 May 1917 | UB 40 | Hans Howaldt | | Jupiter | 2,124 | | br |
| 21 May 1917 | UC 36 | Gustav Buch | | Ferdinand A. | 2,062 | | fr |
| 22 May 1917 | U 46 | Leo Hillebrand | | Tansan Maru | 2,443 | | jp |
| 22 May 1917 | U 47 | Heinrich Metzger | | Lapa | 1,366 | | bz |
| 22 May 1917 | UB 41 | Günther Krause | | Lanthorn | 2,299 | | br |
| 22 May 1917 | UC 21 | Reinhold Saltzwedel | | Jeune Albert | 25 | | fr |
| 22 May 1917 | UC 65 | Otto Steinbrinck | | Merse | 296 | | br |
| 22 May 1917 | UC 69 | Erwin Waßner | | Nann Smith | 2,093 | | nw |
| 23 May 1917 | U 30 | Franz Grünert | | Freden | 166 | | da |
| 23 May 1917 | U 65 | Hermann von Fischel | | England | 3,798 | | br |
| 23 May 1917 | U 65 | Hermann von Fischel | | Maria Febronia Antonina | 55 | | it |
| 23 May 1917 | U 87 | Rudolf Schneider | | Bernisse (d.) | 951 | | nl |
| 23 May 1917 | U 87 | Rudolf Schneider | | Elve | 962 | | nl |
| 23 May 1917 | U 88 | Walther Schwieger | | Hector | 1,146 | | nw |
| 23 May 1917 | UB 41 | Günther Krause | | Monarch | 1,318 | | nw |
| 23 May 1917 | UC 14 | Ulrich Pilzecker | | Tettenhall | 227 | | br |
| 23 May 1917 | UC 21 | Reinhold Saltzwedel | | Harwood Palmer | 2,885 | | am |
| 23 May 1917 | UC 21 | Reinhold Saltzwedel | | Lesto | 1,940 | | br |
| 23 May 1917 | UC 33 | Martin Schelle | | Beinir | 73 | | da |
| 23 May 1917 | UC 33 | Martin Schelle | | Britannia | 69 | | da |
| 23 May 1917 | UC 33 | Martin Schelle | | Else | 78 | | da |
| 23 May 1917 | UC 33 | Martin Schelle | | Margrethe | 104 | | da |
| 23 May 1917 | UC 33 | Martin Schelle | | Olearia | 209 | | br |
| 23 May 1917 | UC 33 | Martin Schelle | | Sisapon | 211 | | br |
| 23 May 1917 | UC 33 | Martin Schelle | | Streymoy | 81 | | da |
| 23 May 1917 | UC 35 | Ernst von Voigt | | Pipitsa | 224 | | gr |
| 23 May 1917 | UC 40 | Gustav Deuerlich | | Gran | 1,153 | | nw |
| 23 May 1917 | UC 64 | Ernst Müller-Schwarz | | Alberdina | 100 | | nl |
| 23 May 1917 | UC 67 | Karl Neumann | | Elmmoor | 3,744 | | br |
| 23 May 1917 | UC 70 | Werner Fürbringer | | Begona N°3 | 2,699 | | sp |
| 24 May 1917 | U 32 | Kurt Hartwig | | Biarritz | 2,758 | | fr |
| 24 May 1917 | U 46 | Leo Hillebrand | | Jersey City | 4,670 | | br |
| 24 May 1917 | U 47 | Heinrich Metzger | | Barbara | 838 | | am |
| 24 May 1917 | U 57 | Carl-Siegfried Ritter von Georg | | Belgian | 3,657 | | br |
| 24 May 1917 | U 65 | Hermann von Fischel | | Sant Antonio Di Padova | 184 | | it |
| 24 May 1917 | UB 38 | Wilhelm Amberger | | Gudrun | 1,472 | | nw |
| 24 May 1917 | UB 38 | Wilhelm Amberger | | Thyra | 285 | | da |
| 24 May 1917 | UC 25 | Johannes Feldkirchner | | Domenico Barone | 171 | | it |
| 24 May 1917 | UC 33 | Martin Schelle | | Brestir | 69 | | da |
| 24 May 1917 | UC 33 | Martin Schelle | | Isabella Innes | 37 | | da |
| 24 May 1917 | UC 33 | Martin Schelle | | Traveller | 76 | | da |
| 24 May 1917 | UC 35 | Ernst von Voigt | | Mcclure | 220 | | br |
| 24 May 1917 | UC 62 | Max Schmitz | | Chicago City (d.) | 2,324 | | br |
| 25 May 1917 | | | | Westland | 1,283 | | nl |
| 25 May 1917 | U 38 | Max Valentiner | | Kohinur | 2,265 | | br |
| 25 May 1917 | U 47 | Heinrich Metzger | | Magnus Manson | 1,751 | | am |
| 25 May 1917 | U 65 | Hermann von Fischel | | Diego Russo | 113 | | it |
| 25 May 1917 | U 65 | Hermann von Fischel | | Natale Monaco | 57 | | it |
| 25 May 1917 | U 65 | Hermann von Fischel | | Rosina R. | 54 | | it |
| 25 May 1917 | U 65 | Hermann von Fischel | | Vincenzino C. | 54 | | it |
| 25 May 1917 | U 88 | Walther Schwieger | | Hilary | 6,329 | | br |
| 25 May 1917 | UC 20 | Hans Adalbert von der Lühe | | Argentina | 97 | | it |
| 25 May 1917 | UC 20 | Hans Adalbert von der Lühe | | Ida | 46 | | it |
| 25 May 1917 | UC 20 | Hans Adalbert von der Lühe | | Unione Salvatore | 57 | | it |
| 25 May 1917 | UC 33 | Martin Schelle | | A. H. Friis | 110 | | da |
| 25 May 1917 | UC 33 | Martin Schelle | | Glyg | 358 | | nw |
| 25 May 1917 | UC 33 | Martin Schelle | | Whinlatter | 1,378 | | nw |
| 25 May 1917 | UC 35 | Ernst von Voigt | | Nicolino | 120 | | it |
| 25 May 1917 | UC 66 | Herbert Pustkuchen | | Sjaelland | 1,405 | | br |
| 26 May 1917 | U 19 | Johannes Spieß | | Norway | 1,447 | | nw |
| 26 May 1917 | U 38 | Max Valentiner | | Holmesbank | 3,051 | | br |
| 26 May 1917 | U 65 | Hermann von Fischel | | Angelo Padre | 50 | | it |
| 26 May 1917 | U 65 | Hermann von Fischel | | Umaria | 5,317 | | br |
| 26 May 1917 | U 87 | Rudolf Schneider | | Lucipara | 1,943 | | ru |
| 26 May 1917 | U 87 | Rudolf Schneider | | Saint Mirren | 1,956 | | br |
| 26 May 1917 | UB 43 | Horst Obermüller | | Dorothy | 4,494 | | gr |
| 26 May 1917 | UC 20 | Hans Adalbert von der Lühe | | Abd Es Salem | 25 | | fr |
| 26 May 1917 | UC 20 | Hans Adalbert von der Lühe | | Dandolo | 50 | | fr |
| 26 May 1917 | UC 20 | Hans Adalbert von der Lühe | | Manoubia | 50 | | fr |
| 26 May 1917 | UC 20 | Hans Adalbert von der Lühe | | Messaouda | 50 | | fr |
| 26 May 1917 | UC 20 | Hans Adalbert von der Lühe | | San Francesco | 47 | | it |
| 26 May 1917 | UC 21 | Reinhold Saltzwedel | | Aristides | 2,179 | | gr |
| 26 May 1917 | UC 21 | Reinhold Saltzwedel | | Norhaug | 1,245 | | nw |
| 26 May 1917 | UC 35 | Ernst von Voigt | | Risorgimento | 222 | | it |
| 26 May 1917 | UC 45 | Hubert Aust | | Saint Hubert | 423 | | fr |
| 26 May 1917 | UC 67 | Karl Neumann | | Dover Castle | 8,271 | | br |
| 26 May 1917 | UC 73 | Kurt Schapler | | Agragas | 850 | | it |
| 27 May 1917 | U 19 | Johannes Spieß | | Debora | 159 | | da |
| 27 May 1917 | U 33 | Gustav Sieß | | Beatrice | 106 | | it |
| 27 May 1917 | U 33 | Gustav Sieß | | Michele Costantino | 51 | | it |
| 27 May 1917 | U 65 | Hermann von Fischel | | Luigi | 137 | | it |
| 27 May 1917 | U 65 | Hermann von Fischel | | Maria Giuseppe | 26 | | it |
| 27 May 1917 | UC 20 | Hans Adalbert von der Lühe | | Boldwell | 3,118 | | br |
| 27 May 1917 | UC 21 | Reinhold Saltzwedel | | Efstathios | 3,847 | | gr |
| 27 May 1917 | UC 50 | Rudolf Seuffer | | Dartmoor | 2,870 | | br |
| 27 May 1917 | UC 70 | Werner Fürbringer | | General De Boisdeffre | 2,195 | | fr |
| 28 May 1917 | U 86 | Friedrich Crüsemann | | Antinoe | 2,396 | | br |
| 28 May 1917 | U 86 | Friedrich Crüsemann | | Limerick | 6,827 | | br |
| 28 May 1917 | U 88 | Walther Schwieger | | Roma (d.) | 417 | | ru |
| 28 May 1917 | UC 21 | Reinhold Saltzwedel | | Hiram | 598 | | nw |
| 28 May 1917 | UC 21 | Reinhold Saltzwedel | | Urna | 2,686 | | nw |
| 28 May 1917 | UC 21 | Reinhold Saltzwedel | | Waldemar | 1,267 | | nw |
| 28 May 1917 | UC 25 | Johannes Feldkirchner | | Nuovo S. Giovanni | 31 | | it |
| 28 May 1917 | UC 25 | Johannes Feldkirchner | | S. Andrea | 27 | | it |
| 28 May 1917 | UC 44 | Kurt Tebbenjohanns | | Turid | 1,148 | | nw |
| 28 May 1917 | UC 45 | Hubert Aust | | Teie | 1,974 | | nw |
| 28 May 1917 | UC 55 | Theodor Schultz | | Asters | 1,531 | | nw |
| 28 May 1917 | UC 70 | Werner Fürbringer | | Ancona | 1,168 | | br |
| 28 May 1917 | UC 72 | Ernst Voigt | | Detlef Wagner | 225 | | br |
| 29 May 1917 | U 28 | Georg Schmidt | | Fridtjof Nansen | 2,190 | | nw |
| 29 May 1917 | U 28 | Georg Schmidt | | Karna | 210 | | nw |
| 29 May 1917 | U 28 | Georg Schmidt | | Kodan | 217 | | nw |
| 29 May 1917 | U 69 | Ernst Wilhelms | | Argo | 123 | | sw |
| 29 May 1917 | U 69 | Ernst Wilhelms | | Consul N. Nielsen | 1,395 | | da |
| 29 May 1917 | U 69 | Ernst Wilhelms | | Ines | 261 | | sw |
| 29 May 1917 | U 86 | Friedrich Crüsemann | | Oswego | 5,793 | | br |
| 29 May 1917 | U 88 | Walther Schwieger | | Ashleaf | 5,768 | | br |
| 29 May 1917 | UC 55 | Theodor Schultz | | Clan Murray | 4,835 | | br |
| 29 May 1917 | UC 74 | Wilhelm Marschall | | Aghia Tom Aghion | 30 | | gr |
| 29 May 1917 | UC 74 | Wilhelm Marschall | | Kirikos | 84 | | gr |
| 29 May 1917 | UC 74 | Wilhelm Marschall | | Yarra | 4,163 | | fr |
| 30 May 1917 | U 87 | Rudolf Schneider | | Bathurst | 2,821 | | br |
| 30 May 1917 | U 87 | Rudolf Schneider | | Hanley | 3,331 | | br |
| 30 May 1917 | k.u.k. U4 | Rudolf Singule | | Italia | 1,305 | | fr |
| 30 May 1917 | UC 21 | Reinhold Saltzwedel | | Sørland | 2,472 | | nw |
| 30 May 1917 | UC 36 | Gustav Buch | | Corbet Woodall | 917 | | br |
| 30 May 1917 | UC 50 | Rudolf Seuffer | | Ina William | 337 | | br |
| 30 May 1917 | UC 55 | Theodor Schultz | | Fernley (d.) | 3,820 | | br |
| 30 May 1917 | UC 62 | Max Schmitz | | Lisbon | 1,203 | | br |
| 31 May 1917 | U 69 | Ernst Wilhelms | | Esneh | 3,247 | | br |
| 31 May 1917 | U 86 | Friedrich Crüsemann | | N. Hadzikyriakos | 3,533 | | gr |
| 31 May 1917 | U 88 | Walther Schwieger | | Jeanne Cordonnier | 2,194 | | fr |
| 31 May 1917 | U 88 | Walther Schwieger | | Miyazaki Maru | 7,892 | | jp |
| 31 May 1917 | UB 23 | Hans Ewald Niemer | | Dirigo | 3,004 | | am |
| 31 May 1917 | UC 25 | Johannes Feldkirchner | | Ninotto | 208 | | it |
| 31 May 1917 | UC 34 | Robert Sprenger | | Ozarda (d.) | 4,791 | | br |
| 31 May 1917 | UC 73 | Kurt Schapler | | Rosebank | 3,837 | | br |
|
| 703,762 | | | 386 ships sunk (618,041 tons) and 27 ships damaged (85,721 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.
|
This map shows where Allied ships were hit during May 1917.
In some cases the exact positions of losses are not known, those are not shown.
