Ships hit by U 91
See the profile page for U 91
| Date | U-boat | Commander | | Name of ship | Tons | Nat. |
| |
| 24 Dec 1917 | U 91 | Alfred von Glasenapp | | Elmleaf (d.) | 5,948 |  | br |
| 28 Dec 1917 | U 91 | Alfred von Glasenapp | | Robert Eggleton | 2,274 |  | br |
| |
| 2 Jan 1918 | U 91 | Alfred von Glasenapp | | Boston City | 2,711 |  | br |
| 4 Jan 1918 | U 91 | Alfred von Glasenapp | | Otto | 139 |  | br |
| 5 Jan 1918 | U 91 | Alfred von Glasenapp | | Knightsgarth | 2,889 |  | br |
| 7 Jan 1918 | U 91 | Alfred von Glasenapp | | Premier | 89 |  | br |
| 19 Feb 1918 | U 91 | Alfred von Glasenapp | | Beacon Light | 2,768 |  | br |
| 22 Feb 1918 | U 91 | Alfred von Glasenapp | | Haileybury | 2,888 |  | br |
| 23 Feb 1918 | U 91 | Alfred von Glasenapp | | Birchleaf (d.) | 5,873 |  | br |
| 23 Feb 1918 | U 91 | Alfred von Glasenapp | | British Viscount | 3,287 |  | br |
| 24 Feb 1918 | U 91 | Alfred von Glasenapp | | Renfrew | 3,830 |  | br |
| 2 Mar 1918 | U 91 | Alfred von Glasenapp | | Bessy | 60 |  | 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 |
| 21 Apr 1918 | U 91 | Alfred von Glasenapp | | Landonia | 2,504 |  | br |
| 21 Apr 1918 | U 91 | Alfred von Glasenapp | | Normandiet | 1,843 |  | br |
| 22 Apr 1918 | U 91 | Alfred von Glasenapp | | Baron Herries | 1,610 |  | br |
| 26 Apr 1918 | U 91 | Alfred von Glasenapp | | Ethel | 100 |  | br |
| 27 Apr 1918 | U 91 | Alfred von Glasenapp | | Gresham | 3,774 |  | br |
| 27 Apr 1918 | U 91 | Alfred von Glasenapp | | Walpas | 312 |  | ru |
| 28 Apr 1918 | U 91 | Alfred von Glasenapp | | Damao | 5,668 |  | pt |
| 28 Apr 1918 | U 91 | Alfred von Glasenapp | | Oronsa | 8,075 |  | br |
| 1 Jul 1918 | U 91 | Alfred von Glasenapp | | Westmoor | 4,329 |  | br |
| 6 Jul 1918 | U 91 | Alfred von Glasenapp | | Port Hardy | 6,533 |  | br |
| 9 Jul 1918 | U 91 | Alfred von Glasenapp | | Silvia | 3,571 |  | it |
| 13 Jul 1918 | U 91 | Alfred von Glasenapp | | Badagri | 2,956 |  | br |
| 16 Jul 1918 | U 91 | Alfred von Glasenapp | | Fisherman | 136 |  | br |
| 25 Jul 1918 | U 91 | Alfred von Glasenapp | | Tippecanoe | 6,187 |  | am |
| 1 Oct 1918 | U 91 | Alfred von Glasenapp | | Therese et Marthe | 32 |  | fr |
| 2 Oct 1918 | U 91 | Alfred von Glasenapp | | Maia | 185 |  | fr |
| 2 Oct 1918 | U 91 | Alfred von Glasenapp | | Marie Emmanuel | 32 |  | fr |
| 2 Oct 1918 | U 91 | Alfred von Glasenapp | | Ave Maris Stella | 22 |  | fr |
| 4 Oct 1918 | U 91 | Alfred von Glasenapp | | Mercedes | 2,164 |  | sp |
| 5 Oct 1918 | U 91 | Alfred von Glasenapp | | Heathpark | 2,205 |  | br |
| 5 Oct 1918 | U 91 | Alfred von Glasenapp | | Erindring | 1,229 |  | br |
| 8 Oct 1918 | U 91 | Alfred von Glasenapp | | Cazengo | 3,009 |  | pt |
| 9 Oct 1918 | U 91 | Alfred von Glasenapp | | Pierre | 354 |  | fr |
| 11 Oct 1918 | U 91 | Alfred von Glasenapp | | Luksefjell | 2,007 |  | nw |
| 14 Oct 1918 | U 91 | Alfred von Glasenapp | | Bayard | 55 |  | fr |
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| 98,940 | | | 37 ships sunk (87,119 tons) and 2 ships damaged (11,821 tons). Legend (d.) means the ship was damaged.
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Below is a map showing the locations of the attacks in question:

In some cases the exact positions of losses are not known, those are not shown.
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