This is the full listing of all ships hit during April 1918. 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 Apr 1918 | U 155 | Erich Eckelmann | | Lusitano | 529 |  | pt |
| 1 Apr 1918 | UC 31 | Kurt Siewert | | Ardglass | 4,617 |  | br |
| 2 Apr 1918 | U 101 | Carl-Siegfried Ritter von Georg | | Solway Queen | 307 |  | br |
| 2 Apr 1918 | U 53 | Hans Rose | | Meaford | 1,889 |  | br |
| 3 Apr 1918 | U 152 | Constantin Kolbe | | Elsie Birdett | 90 |  | br |
| 3 Apr 1918 | UC 54 | Heinrich XXXVII Prinz zu Reuß | | Sylvie | 2,148 |  | fr |
| 4 Apr 1918 | k.u.k. U29 | Leo Prásil | | Edgar (d.) | 7,350 |  | br |
| 4 Apr 1918 | UB 52 | Otto Launburg | | Sincerita | 1,722 |  | it |
| 4 Apr 1918 | UC 25 | Karl Dönitz | | Agatina | 201 |  | it |
| 4 Apr 1918 | UC 35 | Hans Paul Korsch | | Liberia | 1,942 |  | fr |
| 4 Apr 1918 | UC 78 | Hans Kukat | | Eustratios (d.) | 1,481 |  | gr |
| 5 Apr 1918 | UB 64 | Otto von Schrader | | Clam (d.) | 3,552 |  | br |
| 5 Apr 1918 | UC 31 | Kurt Siewert | | Cyrene | 2,904 |  | br |
| 5 Apr 1918 | UC 35 | Hans Paul Korsch | | Camelia | 396 |  | it |
| 6 Apr 1918 | U 19 | Johannes Spieß | | Sterne | 108 |  | nl |
| 6 Apr 1918 | UB 50 | Franz Becker | | Madeleine Iii | 149 |  | fr |
| 6 Apr 1918 | UC 52 | Hellmuth von Doemming | | Madona Belle Grazie | 105 |  | it |
| 7 Apr 1918 | U 111 | Hans Beyersdorff | | Boscastle | 2,346 |  | br |
| 7 Apr 1918 | U 154 | Hermann Gercke | | La Bruyere (d.) | 2,198 |  | fr |
| 7 Apr 1918 | U 155 | Erich Eckelmann | | Sterope | 9,500 |  | it |
| 7 Apr 1918 | U 53 | Hans Rose | | Cadillac (d.) | 11,106 |  | br |
| 7 Apr 1918 | U 53 | Hans Rose | | Knight Templar (d.) | 7,175 |  | br |
| 7 Apr 1918 | U 53 | Hans Rose | | Port Campbell | 6,230 |  | br |
| 7 Apr 1918 | UB 73 | Karl Neureuther | | Catriena | 115 |  | nl |
| 7 Apr 1918 | UB 74 | Ernst Steindorff | | Rye | 986 |  | br |
| 7 Apr 1918 | UC 71 | Walter Warzecha | | Highland Brigade | 5,669 |  | br |
| 8 Apr 1918 | U 82 | Hans Adam | | Tainui (d.) | 9,965 |  | br |
| 8 Apr 1918 | U 90 | Walter Remy | | Superb | 489 |  | nw |
| 8 Apr 1918 | UB 33 | Fritz Gregor | | Nyassaland | 383 |  | nw |
| 8 Apr 1918 | UC 34 | Horst Obermüller | | Bengali | 5,684 |  | br |
| 9 Apr 1918 | U 154 | Hermann Gercke | | President Howard | 73 |  | lib |
| 9 Apr 1918 | UB 109 | Kurt Ramien | | President Leroy-lallier | 1,320 |  | fr |
| 9 Apr 1918 | UB 53 | Robert Sprenger | | Aveiro | 2,209 |  | pt |
| 9 Apr 1918 | UC 34 | Horst Obermüller | | Vasconia | 3,052 |  | nw |
| 9 Apr 1918 | UC 52 | Hellmuth von Doemming | | Sunik (d.) | 5,017 |  | br |
| 10 Apr 1918 | U 154 | Hermann Gercke | | Burutu (d.) | 3,902 |  | br |
| 10 Apr 1918 | U 82 | Hans Adam | | Westfield | 3,453 |  | br |
| 10 Apr 1918 | UB 109 | Kurt Ramien | | Henley | 3,249 |  | br |
| 10 Apr 1918 | UB 68 | Heino von Heimburg | | Warwickshire (d.) | 8,012 |  | br |
| 10 Apr 1918 | UB 74 | Ernst Steindorff | | Paul Paix (d.) | 4,196 |  | br |
| 10 Apr 1918 | UC 31 | Kurt Siewert | | Magic (d.) | 1,025 |  | br |
| 10 Apr 1918 | UC 52 | Hellmuth von Doemming | | Airedale (d.) | 3,044 |  | br |
| 11 Apr 1918 | UB 50 | Franz Becker | | Carmela G | 41 |  | it |
| 11 Apr 1918 | UB 50 | Franz Becker | | Highland Prince | 3,390 |  | br |
| 11 Apr 1918 | UB 64 | Otto von Schrader | | Lakemoor | 2,045 |  | am |
| 11 Apr 1918 | UB 68 | Heino von Heimburg | | Kingstonian (d.) | 6,564 |  | br |
| 11 Apr 1918 | UB 73 | Karl Neureuther | | Myrtle Branch | 3,741 |  | br |
| 11 Apr 1918 | UB 86 | Hans Trenk | | King Alfred (d.) | 14,150 |  | br |
| 11 Apr 1918 | UC 23 | Hans Georg Lübbe | | Trud (p.) | 610 |  | ru |
| 12 Apr 1918 | | | | Sonja | unknown |  | nw |
| 12 Apr 1918 | U 104 | Kurt Bernis | | Njaal | 578 |  | ru |
| 12 Apr 1918 | U 34 | Johannes Klasing | | Autolycus | 5,806 |  | br |
| 12 Apr 1918 | U 34 | Johannes Klasing | | Moyune | 4,935 |  | br |
| 12 Apr 1918 | UB 74 | Ernst Steindorff | | Luisa | 3,603 |  | sp |
| 12 Apr 1918 | UC 4 | Ernst Berlin | | Lonhelen | 1,281 |  | br |
| 12 Apr 1918 | UC 71 | Walter Warzecha | | Luis | 4,284 |  | br |
| 13 Apr 1918 | U 155 | Erich Eckelmann | | Harewood | 4,150 |  | br |
| 13 Apr 1918 | UB 109 | Kurt Ramien | | Wilson | 110 |  | br |
| 13 Apr 1918 | UB 16 | Rudolf Stier | | Ruth | 44 |  | br |
| 13 Apr 1918 | UB 68 | Heino von Heimburg | | Provence (d.) | 3,941 |  | fr |
| 13 Apr 1918 | UC 20 | Heinrich Kukat | | Giove (d.) | 5,037 |  | it |
| 14 Apr 1918 | U 107 | Kurt Slevogt | | Marstonmoor | 2,744 |  | br |
| 14 Apr 1918 | U 153 | Gernot Goetting | | Santa Isabel | 2,023 |  | br |
| 14 Apr 1918 | UB 73 | Karl Neureuther | | Chelford | 2,995 |  | br |
| 14 Apr 1918 | UB 74 | Ernst Steindorff | | Maroc | 2,808 |  | fr |
| 14 Apr 1918 | UC 23 | Hans Georg Lübbe | | Kazak (p.) | 622 |  | ru |
| 14 Apr 1918 | UC 23 | Hans Georg Lübbe | | Olga (p.) | 327 |  | ru |
| 14 Apr 1918 | UC 23 | Hans Georg Lübbe | | Unidentified Lighter | 100 |  | ru |
| 15 Apr 1918 | UB 74 | Ernst Steindorff | | Tanfield (d.) | 4,538 |  | br |
| 15 Apr 1918 | UB 80 | Max Viebeg | | Ailsa Craig | 601 |  | br |
| 15 Apr 1918 | UC 23 | Hans Georg Lübbe | | Rostov | 1,280 |  | ru |
| 15 Apr 1918 | UC 77 | Johannes Ries | | City Of Winchester (d.) | 7,981 |  | br |
| 15 Apr 1918 | UC 77 | Johannes Ries | | Pomeranian | 4,241 |  | br |
| 16 Apr 1918 | U 100 | Degenhart von Loë | | Lake Michigan | 9,288 |  | br |
| 16 Apr 1918 | U 104 | Kurt Bernis | | Widwud | 299 |  | ru |
| 16 Apr 1918 | U 155 | Erich Eckelmann | | Nirpura | 7,640 |  | br |
| 16 Apr 1918 | UB 73 | Karl Neureuther | | Ladoga | 1,917 |  | br |
| 16 Apr 1918 | UB 73 | Karl Neureuther | | Lodaner | 3,291 |  | br |
| 16 Apr 1918 | UB 80 | Max Viebeg | | George Harper (d.) | 1,613 |  | br |
| 16 Apr 1918 | UC 22 | Carl Bünte | | Romania | 2,562 |  | it |
| 16 Apr 1918 | UC 75 | Walter Schmitz | | Hungerford | 5,811 |  | br |
| 18 Apr 1918 | UB 109 | Kurt Ramien | | Runswick | 3,060 |  | br |
| 18 Apr 1918 | UB 40 | Karl Dobberstein | | Pentyrch | 3,312 |  | br |
| 18 Apr 1918 | UB 73 | Karl Neureuther | | Dalegarth Force | 684 |  | br |
| 18 Apr 1918 | UB 80 | Max Viebeg | | Bamse | 958 |  | br |
| 18 Apr 1918 | UB 86 | Hans Trenk | | Gregynog | 1,701 |  | br |
| 19 Apr 1918 | U 34 | Johannes Klasing | | Helka | 2,128 |  | gr |
| 19 Apr 1918 | U 34 | Johannes Klasing | | Lord Charlemont | 3,209 |  | br |
| 19 Apr 1918 | U 38 | Clemens Wickel | | Salambo | 248 |  | fr |
| 19 Apr 1918 | UC 75 | Walter Schmitz | | War Helmet | 8,184 |  | br |
| 20 Apr 1918 | U 91 | Alfred von Glasenapp | | Florrieston | 3,366 |  | br |
| 20 Apr 1918 | U 91 | Alfred von Glasenapp | | Lowther Range | 3,926 |  | br |
| 20 Apr 1918 | UC 4 | Ernst Berlin | | Numitor | 242 |  | br |
| 21 Apr 1918 | U 19 | Johannes Spieß | | Delta A. | 241 |  | be |
| 21 Apr 1918 | U 32 | Kurt Albrecht | | Bellview | 3,567 |  | br |
| 21 Apr 1918 | U 91 | Alfred von Glasenapp | | Landonia | 2,504 |  | br |
| 21 Apr 1918 | U 91 | Alfred von Glasenapp | | Normandiet | 1,843 |  | br |
| 21 Apr 1918 | UB 34 | Erich Förste | | Lompoc (d.) | 7,270 |  | br |
| 21 Apr 1918 | UB 80 | Max Viebeg | | Westergate | 1,760 |  | br |
| 22 Apr 1918 | U 104 | Kurt Bernis | | Fern | 444 |  | br |
| 22 Apr 1918 | U 34 | Johannes Klasing | | Dronning Maud | 2,663 |  | br |
| 22 Apr 1918 | U 91 | Alfred von Glasenapp | | Baron Herries | 1,610 |  | br |
| 22 Apr 1918 | UB 103 | Paul Hundius | | Eric Calvert | 1,862 |  | br |
| 22 Apr 1918 | UB 53 | Robert Sprenger | | Kheda Moulekar | 40 |  | fr |
| 22 Apr 1918 | UB 53 | Robert Sprenger | | Marshalla | 77 |  | br |
| 22 Apr 1918 | UB 53 | Robert Sprenger | | Sadika | 45 |  | fr |
| 22 Apr 1918 | UB 53 | Robert Sprenger | | Welbeck Hall | 5,643 |  | br |
| 23 Apr 1918 | U 155 | Erich Eckelmann | | Frances | 89 |  | br |
| 23 Apr 1918 | U 19 | Johannes Spieß | | Peregrine | 79 |  | br |
| 23 Apr 1918 | U 19 | Johannes Spieß | | Tyne Wave | 121 |  | br |
| 23 Apr 1918 | U 80 | Karl Koopmann | | Plethos | 210 |  | br |
| 23 Apr 1918 | UB 105 | Wilhelm Marschall | | Leonor | 166 |  | pt |
| 23 Apr 1918 | UB 105 | Wilhelm Marschall | | Restaurado | 150 |  | pt |
| 23 Apr 1918 | UC 40 | Hermann Menzel | | Emley | 223 |  | br |
| 23 Apr 1918 | UC 64 | Ferdinand Schwartz | | Laurium | 582 |  | br |
| 24 Apr 1918 | | | | Agnete | 1,127 |  | br |
| 24 Apr 1918 | UB 53 | Robert Sprenger | | Mabrouska | 256 |  | fr |
| 25 Apr 1918 | U 153 | Gernot Goetting | | Willow Branch | 3,314 |  | br |
| 25 Apr 1918 | U 154 | Hermann Gercke | | Kawachi Maru (d.) | 5,749 |  | jp |
| 25 Apr 1918 | U 154 | Hermann Gercke | | Michelet | 2,636 |  | fr |
| 25 Apr 1918 | U 19 | Johannes Spieß | | Hollandia I (p.) | 733 |  | nl |
| 25 Apr 1918 | UB 105 | Wilhelm Marschall | | Cowslip | 1,290 |  | br |
| 25 Apr 1918 | UB 31 | Wilhelm Braun | | Joseph | 42 |  | fr |
| 25 Apr 1918 | UB 80 | Max Viebeg | | Sevilla | 1,318 |  | nw |
| 25 Apr 1918 | UC 4 | Ernst Berlin | | St. Seiriol | 928 |  | br |
| 25 Apr 1918 | UC 64 | Ferdinand Schwartz | | Sote | 1,353 |  | sw |
| 26 Apr 1918 | U 91 | Alfred von Glasenapp | | Ethel | 100 |  | br |
| 26 Apr 1918 | UB 48 | Wolfgang Steinbauer | | Upada (d.) | 5,257 |  | br |
| 26 Apr 1918 | UB 68 | Heino von Heimburg | | Angelina Di Paola | 228 |  | it |
| 26 Apr 1918 | UC 17 | Erich Stephan | | Sif (d.) | 3,282 |  | nw |
| 26 Apr 1918 | UC 64 | Ferdinand Schwartz | | Llwyngwair | 1,304 |  | br |
| 27 Apr 1918 | U 91 | Alfred von Glasenapp | | Gresham | 3,774 |  | br |
| 27 Apr 1918 | U 91 | Alfred von Glasenapp | | Walpas | 312 |  | ru |
| 27 Apr 1918 | UB 48 | Wolfgang Steinbauer | | Romany | 3,983 |  | br |
| 27 Apr 1918 | UB 53 | Robert Sprenger | | Azizeh | 30 |  | fr |
| 27 Apr 1918 | UB 53 | Robert Sprenger | | Nemaat Kheda | 40 |  | fr |
| 28 Apr 1918 | U 60 | Franz Grünert | | Poitiers | 2,045 |  | fr |
| 28 Apr 1918 | U 60 | Franz Grünert | | Rimfakse | 1,119 |  | nw |
| 28 Apr 1918 | U 91 | Alfred von Glasenapp | | Damao | 5,668 |  | pt |
| 28 Apr 1918 | U 91 | Alfred von Glasenapp | | Oronsa | 8,075 |  | br |
| 28 Apr 1918 | UB 103 | Paul Hundius | | Elba | 1,081 |  | br |
| 28 Apr 1918 | UC 20 | Heinrich Kukat | | Verdun | 2,769 |  | fr |
| 28 Apr 1918 | UC 40 | Hermann Menzel | | Upcerne | 2,984 |  | br |
| 29 Apr 1918 | U 105 | Friedrich Strackerjan | | Christiana Davis | 86 |  | br |
| 29 Apr 1918 | U 105 | Friedrich Strackerjan | | Johnny Toole | 84 |  | br |
| 29 Apr 1918 | U 60 | Franz Grünert | | Saint Chamond | 2,866 |  | fr |
| 29 Apr 1918 | k.u.k. U27 | Josef Holub | | Maria | 40 |  | gr |
| 29 Apr 1918 | UB 105 | Wilhelm Marschall | | City Of Pensacola | 705 |  | am |
| 29 Apr 1918 | UB 105 | Wilhelm Marschall | | Kut Sang | 4,895 |  | br |
| 29 Apr 1918 | UB 48 | Wolfgang Steinbauer | | Dalkeith | 748 |  | br |
| 29 Apr 1918 | UB 48 | Wolfgang Steinbauer | | Kingstonian | 6,564 |  | br |
| 29 Apr 1918 | UB 48 | Wolfgang Steinbauer | | Monte Bianco (d.) | 988 |  | fr |
| 29 Apr 1918 | UB 48 | Wolfgang Steinbauer | | Moose (d.) | 208 |  | br |
| 29 Apr 1918 | UB 57 | Johannes Lohs | | Australier | 3,687 |  | br |
| 29 Apr 1918 | UB 57 | Johannes Lohs | | Broderick | 4,321 |  | br |
| 29 Apr 1918 | UB 57 | Johannes Lohs | | La Somme | 1,477 |  | fr |
| 29 Apr 1918 | UC 17 | Erich Stephan | | Frogner | 1,476 |  | nw |
| 30 Apr 1918 | U 86 | Helmut Patzig | | Kafue | 6,044 |  | br |
| 30 Apr 1918 | U 86 | Helmut Patzig | | Kempock | 255 |  | br |
| 30 Apr 1918 | UB 105 | Wilhelm Marschall | | Conway | 4,003 |  | br |
| 30 Apr 1918 | UB 57 | Johannes Lohs | | Ella Sayer | 2,549 |  | br |
| 30 Apr 1918 | UB 57 | Johannes Lohs | | Umba | 2,042 |  | br |
| 30 Apr 1918 | UC 17 | Erich Stephan | | Isleworth | 2,871 |  | br |
| 30 Apr 1918 | UC 74 | Hans Adalbert von der Lühe | | Kalliope | 114 |  | br |
|
| 425,906 | | | 138 ships sunk (291,305 tons) and 26 ships damaged (134,601 tons). Legend (d.) means the ship was damaged. (p.) means the ship was taken as prize (included in ships & tonnage lost).
|
This map shows where Allied ships were hit during April 1918.
Resource id #192
ms = 14.40N17.54W,21.00N17.56W,31.21N29.47E,32.07N32.32E,32.08N32.50E,32.11N32.39E,32.13N32.40E,32.44N32.40E,35.06N14.24E,35.38N13.20E,36.15N03.04W,36.17N14.48E,36.24N18.06E,37.10N00.28W,37.10N16.50W,37.13N11.21E,37.26N00.06E,37.27N00.006W,37.27N09.53E,37.32N11.32E,38.00N04.56E,38.06N15.36E,38.13N15.35E,38.22N08.00E,38.25N10.54E,38.30N18.06E,38.44N18.09W,38.57N11.55W,38.58N04.21E,39.20N07.10E,39.43N23.15E,39.50N07.00E,39.55N07.02E,40.24N19.14E,41.43N03.09E,42.04N07.02E,44.20N34.48E,44.35N34.20E,46.33N12.05W,48.13N11.29W,48.50N05.13W,49.10N06.46W,49.33N04.10W,49.35N05.31W,49.57N00.07W,50.04N05.02W,50.07N05.49W,50.13N05.48W,50.15N05.30W,50.24N03.23W,50.27N07.06W,50.30N02.48W,50.33N00.35W,50.33N05.03W,50.35N01.14W,50.47N04.44W,50.49N00.48E,50.51N04.42W,50.52N00.58E,50.54N04.35W,52.07N01.45E,52.14N05.05W,53.25N04.57W,54.30N05.11W,55.30N11.52W,58.04N04.14E,59.34N04.54W
In some cases the exact positions of losses are not known, those are not shown.