This is the full listing of all ships hit during May 1915. 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 1915 | U 30 | Erich von Rosenberg-Grusczyski | | Edale | 3,110 |  | br |
| 1 May 1915 | U 30 | Erich von Rosenberg-Grusczyski | | Europe | 1,887 |  | fr |
| 1 May 1915 | U 30 | Erich von Rosenberg-Grusczyski | | Gulflight (d.) | 5,189 |  | am |
| 1 May 1915 | U 39 | Walter Forstmann | | Balduin | 1,059 |  | nw |
| 1 May 1915 | U 39 | Walter Forstmann | | Elsa | 120 |  | sw |
| 1 May 1915 | UB 6 | Erich Haecker | | Recruit | 335 |  | br |
| 2 May 1915 | U 39 | Walter Forstmann | | St. Louis No. 1 | 211 |  | br |
| 2 May 1915 | U 39 | Walter Forstmann | | Sunray | 165 |  | br |
| 2 May 1915 | U 41 | Claus Hansen | | America | 3,706 |  | nw |
| 2 May 1915 | U 41 | Claus Hansen | | Cruiser | 146 |  | br |
| 2 May 1915 | U 41 | Claus Hansen | | Martaban | 148 |  | br |
| 2 May 1915 | U 41 | Claus Hansen | | Mercury | 222 |  | br |
| 2 May 1915 | U 41 | Claus Hansen | | St. George | 215 |  | br |
| 3 May 1915 | U 30 | Erich von Rosenberg-Grusczyski | | Minterne | 3,018 |  | br |
| 3 May 1915 | U 39 | Walter Forstmann | | Scottish Queen | 125 |  | br |
| 3 May 1915 | U 41 | Claus Hansen | | Oscar | 107 |  | nw |
| 3 May 1915 | U 41 | Claus Hansen | | Roxane (p.) | 355 |  | sw |
| 3 May 1915 | U 9 | Johannes Spieß | | Bob White | 191 |  | br |
| 3 May 1915 | U 9 | Johannes Spieß | | Coquet | 176 |  | br |
| 3 May 1915 | U 9 | Johannes Spieß | | Hector | 179 |  | br |
| 3 May 1915 | U 9 | Johannes Spieß | | Hero | 173 |  | br |
| 3 May 1915 | U 9 | Johannes Spieß | | Iolanthe | 179 |  | br |
| 3 May 1915 | U 9 | Johannes Spieß | | Northward Ho | 180 |  | br |
| 3 May 1915 | U 9 | Johannes Spieß | | Progress | 273 |  | br |
| 4 May 1915 | U 39 | Walter Forstmann | | Elsa | 329 |  | sw |
| 4 May 1915 | U 9 | Johannes Spieß | | Rugby | 205 |  | br |
| 5 May 1915 | U 20 | Walther Schwieger | | Earl Of Lathom | 132 |  | br |
| 5 May 1915 | U 39 | Walter Forstmann | | Sceptre | 166 |  | br |
| 5 May 1915 | U 9 | Johannes Spieß | | Straton | 198 |  | br |
| 6 May 1915 | U 20 | Walther Schwieger | | Candidate | 5,858 |  | br |
| 6 May 1915 | U 20 | Walther Schwieger | | Centurion | 5,495 |  | br |
| 6 May 1915 | U 39 | Walter Forstmann | | Truro | 836 |  | br |
| 6 May 1915 | U 9 | Johannes Spieß | | Merrie Islington | 147 |  | br |
| 7 May 1915 | U 20 | Walther Schwieger | | Lusitania | 30,396 |  | br |
| 7 May 1915 | U 39 | Walter Forstmann | | Benington | 126 |  | br |
| 8 May 1915 | U 36 | Ernst Graeff | | Lilian Drost | 1,966 |  | da |
| 8 May 1915 | U 9 | Johannes Spieß | | Don | 939 |  | br |
| 8 May 1915 | U 9 | Johannes Spieß | | Queen Wilhelmina | 3,590 |  | br |
| 10 May 1915 | U 36 | Ernst Graeff | | Björn (p.) | 1,241 |  | sw |
| 10 May 1915 | U 36 | Ernst Graeff | | Niobe (p.) | 654 |  | nl |
| 10 May 1915 | U 39 | Walter Forstmann | | Olga (p.) | 798 |  | da |
| 15 May 1915 | U 23 | Hans Schultheß | | Martha | 1,182 |  | da |
| 18 May 1915 | U 27 | Bernd Wegener | | Drumcree | 4,052 |  | br |
| 19 May 1915 | U 23 | Hans Schultheß | | Chrysolite | 222 |  | br |
| 19 May 1915 | U 23 | Hans Schultheß | | Crimond | 173 |  | br |
| 19 May 1915 | U 23 | Hans Schultheß | | Lucerne | 154 |  | br |
| 19 May 1915 | U 27 | Bernd Wegener | | Dumfries | 4,121 |  | br |
| 21 May 1915 | U 27 | Bernd Wegener | | Glenholm | 1,968 |  | br |
| 22 May 1915 | U 23 | Hans Schultheß | | Minerva | 3,735 |  | nw |
| 25 May 1915 | U 21 | Otto Hersing | | Triumph | 11,985 |  | br |
| 25 May 1915 | U 41 | Claus Hansen | | Nebraskan (d.) | 4,409 |  | am |
| 26 May 1915 | U 16 | Leo Hillebrand | | Betty | 2,109 |  | da |
| 26 May 1915 | U 16 | Leo Hillebrand | | M. Roosval | 309 |  | sw |
| 26 May 1915 | U 41 | Claus Hansen | | Morwenna | 1,414 |  | br |
| 27 May 1915 | U 21 | Otto Hersing | | Majestic | 14,900 |  | br |
| 27 May 1915 | U 41 | Claus Hansen | | Cadeby | 1,130 |  | br |
| 28 May 1915 | U 16 | Leo Hillebrand | | Mars | 251 |  | ru |
| 28 May 1915 | U 41 | Claus Hansen | | Ethiope | 3,794 |  | br |
| 28 May 1915 | U 41 | Claus Hansen | | Spennymoor | 2,733 |  | br |
| 28 May 1915 | U 41 | Claus Hansen | | Tullochmoor | 3,520 |  | br |
| 29 May 1915 | U 41 | Claus Hansen | | Cysne | 623 |  | pt |
| 29 May 1915 | U 41 | Claus Hansen | | Dixiana | 3,329 |  | br |
| 29 May 1915 | U 41 | Claus Hansen | | Glenlee | 4,140 |  | br |
| 29 May 1915 | k.u.k. U12 | Egon Lerch | | Virginia | 1,065 |  | gr |
| 29 May 1915 | UB 8 | Ernst von Voigt | | Merion | 19,380 |  | br |
| 30 May 1915 | U 16 | Leo Hillebrand | | Søborg | 2,108 |  | da |
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| 167,351 | | | 64 ships sunk (157,753 tons) and 2 ships damaged (9,598 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.
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This map shows where Allied ships were hit during May 1915.
Resource id #95
ms = 43.35N13.30E,49.19N05.21W,49.39N04.16W,49.40N06.10W,49.54N06.30W,50.09N07.30W,50.27N08.44W,50.41N05.00W,50.46N05.02W,51.12N10.47W,51.24N08.31W,55.49N00.22E,55.50N00.40W,56.40N04.00E,56.53N02.30E,56.55N04.20E,56.58N03.15E,57.20N01.09W
In some cases the exact positions of losses are not known, those are not shown.