Ships hit by UB 31
See the profile page for UB 31
| Date | U-boat | Commander | Name of ship | Type of ship | Tons | Nat. | ||
|---|---|---|---|---|---|---|---|---|
| 9 Apr 1917 | UB 31 | Thomas Bieber | Kittiwake | Steamer | 1,866 |  | br | |
| 24 Apr 1917 | UB 31 | Thomas Bieber | Saint Jacques (d.) | Sailing vessel | 415 |  | fr | |
| 28 Apr 1917 | UB 31 | Thomas Bieber |  | Medina | Passenger steamer | 12,350 | | br |
| 21 May 1917 | UB 31 | Thomas Bieber | City Of Corinth | Steamer | 5,870 | | br | |
| 15 Jun 1917 | UB 31 | Thomas Bieber | Teesdale (d.) | Steamer | 2,470 | | br | |
| 17 Jun 1917 | UB 31 | Thomas Bieber | Stanhope | Steamer | 2,854 | | br | |
| 5 Jul 1917 | UB 31 | Thomas Bieber | Ocean Swell | Sailing vessel | 195 | | br | |
| 6 Jul 1917 | UB 31 | Thomas Bieber | Ariadne Christine (d.) | Steamer | 3,550 | | br | |
| 7 Jul 1917 | UB 31 | Thomas Bieber | Bellucia | Steamer | 4,368 | | br | |
| 10 Jul 1917 | UB 31 | Thomas Bieber | Hildegard | Sailing vessel | 622 |  | am | |
| 11 Jul 1917 | UB 31 | Thomas Bieber | Brunhilda | Steamer | 2,296 | | br | |
| 1 Aug 1917 | UB 31 | Thomas Bieber | Alcyone | Motor vessel | 149 | | br | |
| 1 Aug 1917 | UB 31 | Thomas Bieber | Laertes | Steamer | 4,541 | | br | |
| 2 Aug 1917 | UB 31 | Thomas Bieber | Newlyn | Steamer | 4,019 | | br | |
| 3 Aug 1917 | UB 31 | Thomas Bieber | Renee Marthe | Sailing vessel | 49 | | fr | |
| 8 Aug 1917 | UB 31 | Thomas Bieber | Algerie (d.) | Steamer | 3,386 | | fr | |
| 8 Sep 1917 | UB 31 | Thomas Bieber | Elizabeth | Sailing vessel | 58 | | br | |
| 9 Sep 1917 | UB 31 | Thomas Bieber | Pluton | Steamer | 1,449 |  | nw | |
| 19 Oct 1917 | UB 31 | Thomas Bieber | Waikawa | Steamer | 5,666 | | br | |
| 20 Oct 1917 | UB 31 | Thomas Bieber | Colorado | Steamer | 7,165 | | br | |
| 23 Oct 1917 | UB 31 | Thomas Bieber | Lepanto (d.) | Steamer | 6,389 | | br | |
| 19 Nov 1917 | UB 31 | Thomas Bieber | Farn | Steamer | 4,393 | | br | |
| 13 Dec 1917 | UB 31 | Thomas Bieber | Britannic | Sailing vessel | 92 | | br | |
| 15 Dec 1917 | UB 31 | Thomas Bieber | Sachem (d.) | Steamer | 5,354 | | br | |
| 18 Dec 1917 | UB 31 | Thomas Bieber | Riversdale | Steamer | 2,805 | | br | |
| 20 Dec 1917 | UB 31 | Thomas Bieber | Alice Marie | Steamer | 2,210 | | br | |
| 20 Dec 1917 | UB 31 | Thomas Bieber | Eveline | Steamer | 2,605 | | br | |
| 20 Dec 1917 | UB 31 | Thomas Bieber | Warsaw | Steamer | 608 | | br | |
| 22 Jan 1918 | UB 31 | Thomas Bieber | Admiral Cochrane (d.) | Steamer | 6,565 | | br | |
| 22 Jan 1918 | UB 31 | Thomas Bieber | Greatham | Steamer | 2,338 | | br | |
| 24 Jan 1918 | UB 31 | Thomas Bieber | Elsa | Steamer | 3,581 | | nw | |
| 28 Feb 1918 | UB 31 | Wilhelm Braun | Heenvliet | Steamer | 492 |  | nl | |
| 20 Mar 1918 | UB 31 | Wilhelm Braun | Boorara (d.) | Steamer | 6,570 | | br | |
| 24 Apr 1918 | UB 31 | Wilhelm Braun | Agnete | Steamer | 1,127 | | br | |
| 25 Apr 1918 | UB 31 | Wilhelm Braun | Joseph | Sailing vessel | 42 | | fr | |
| 108,509 | ||||||||
| 27 ships sunk (73,810 tons) and 8 ships damaged (34,699 tons).
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