Bertha
| Name | Bertha |
| Type | Sailing vessel
|
| GRT | 203 tons |
| Country |  Norwegian |
| Built | 1865
|
| Builder | E. Dreyer, Altona
|
| Operator | Thygo Sørensen A/S, Kristiania
|
| History | Wooden schooner.
|
U-boat attacks on Sailing vessel Bertha
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties |
| 1 | 15 Jul 1916 | UB 18 (Otto Steinbrinck) | Sunk | Stopped and set on fire 60 miles E of West Hartlepool.
|
| Tønsberg – West Hartlepool
| pitprops
| 0
|
| Vessel eventually found derelict and towed in but a total loss.
|
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