German U-boat U-20
E893324
German U-boat U-20 was an Imperial German Navy submarine from World War I, best known for torpedoing the British ocean liner RMS Lusitania in 1915, an event that significantly influenced public opinion against Germany.
All labels observed (1)
| Label | Occurrences |
|---|---|
| German U-boat U-20 canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T10903554 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: German U-boat U-20 Context triple: [sinking of the RMS Lusitania, attacker, German U-boat U-20]
-
A.
German U-boat U-47
German U-boat U-47 was a World War II German submarine commanded by Günther Prien, best known for its daring and highly successful 1939 raid into the British naval base at Scapa Flow.
-
B.
German submarine U-96
German submarine U-96 was a Type VIIC U-boat of Nazi Germany’s Kriegsmarine in World War II, best known as the real-life inspiration for the novel and film "Das Boot."
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C.
German submarine U-75
German submarine U-75 was a Type VIIB U-boat of Nazi Germany's Kriegsmarine that operated during World War II, conducting Atlantic patrols and commerce raiding before being sunk in 1941.
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D.
U-9
U-9 was a German World War I U-boat famed for its early and dramatic successes in submarine warfare, including the sinking of three British cruisers in a single engagement in 1914.
-
E.
German submarine U-616
German submarine U-616 was a Type VIIC U-boat of Nazi Germany's Kriegsmarine that operated in the Mediterranean during World War II, engaging Allied naval forces before being sunk in 1944.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: German U-boat U-20 Target entity description: German U-boat U-20 was an Imperial German Navy submarine from World War I, best known for torpedoing the British ocean liner RMS Lusitania in 1915, an event that significantly influenced public opinion against Germany.
-
A.
German U-boat U-47
German U-boat U-47 was a World War II German submarine commanded by Günther Prien, best known for its daring and highly successful 1939 raid into the British naval base at Scapa Flow.
-
B.
German submarine U-96
German submarine U-96 was a Type VIIC U-boat of Nazi Germany’s Kriegsmarine in World War II, best known as the real-life inspiration for the novel and film "Das Boot."
-
C.
German submarine U-75
German submarine U-75 was a Type VIIB U-boat of Nazi Germany's Kriegsmarine that operated during World War II, conducting Atlantic patrols and commerce raiding before being sunk in 1941.
-
D.
U-9
U-9 was a German World War I U-boat famed for its early and dramatic successes in submarine warfare, including the sinking of three British cruisers in a single engagement in 1914.
-
E.
German submarine U-616
German submarine U-616 was a Type VIIC U-boat of Nazi Germany's Kriegsmarine that operated in the Mediterranean during World War II, engaging Allied naval forces before being sunk in 1944.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
German Type U 19 submarine
ⓘ
Imperial German Navy warship ⓘ military submarine ⓘ |
| armament |
1 stern torpedo tube
ⓘ
4 bow torpedo tubes ⓘ deck gun ⓘ |
| beam | 6.10 metres ⓘ |
| builder | Kaiserliche Werft Danzig ⓘ |
| builtAt |
Danzig
ⓘ
linked to:
city of Danzig
|
| commissionedOn | 1913 ⓘ |
| conflict | World War I ⓘ |
| countryOfOrigin | German Empire ⓘ |
| crewComplement | about 35 ⓘ |
| dateOfLoss | 5 November 1916 ⓘ |
| displacementSubmerged | 837 tonnes ⓘ |
| displacementSurfaced | 650 tonnes ⓘ |
| draft | 3.60 metres ⓘ |
| engagement | sinking of RMS Lusitania ⓘ |
| fate |
ran aground
ⓘ
scuttled ⓘ |
| historicalSignificance | one of the most infamous U-boats of World War I ⓘ |
| impact |
contributed to shift of public opinion against Germany
ⓘ
increased tensions between Germany and the United States ⓘ |
| laidDownOn | 1912 ⓘ |
| launchedOn | 1912 ⓘ |
| length | 64.15 metres ⓘ |
| locationOfLusitaniaSinking | off the Old Head of Kinsale, Ireland ⓘ |
| maximumSpeedSubmerged | 9.5 knots ⓘ |
| maximumSpeedSurfaced | 15.4 knots ⓘ |
| navalEnsign |
war ensign of the German Empire
ⓘ
linked to:
Imperial German war ensign
|
| notableCommander | Walther Schwieger ⓘ |
| operatedBy | Imperial German Navy ⓘ |
| partOf | High Seas Fleet ⓘ |
| patrolledArea |
Irish Sea
ⓘ
North Atlantic Ocean ⓘ
linked to:
North Atlantic
|
| placeOfLoss | near Vrist, Jutland, Denmark ⓘ |
| propulsion |
diesel engines for surface running
ⓘ
electric motors for submerged running ⓘ |
| reasonForScuttling | to prevent capture ⓘ |
| serviceEnd | World War I ⓘ |
| serviceStart | pre-war Imperial German Navy ⓘ |
| shipClass | Type U 19 submarine ⓘ |
| torpedoComplement | 6 torpedoes ⓘ |
| torpedoed | RMS Lusitania ⓘ |
| torpedoedDate | 7 May 1915 ⓘ |
| victimShipFlag | United Kingdom ⓘ |
| victimShipType | ocean liner ⓘ |
| wreckStatus | partly salvaged ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: German U-boat U-20 Description of subject: German U-boat U-20 was an Imperial German Navy submarine from World War I, best known for torpedoing the British ocean liner RMS Lusitania in 1915, an event that significantly influenced public opinion against Germany.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.