U-20
E236959
U-20 was a German World War I U-boat best known for sinking the British ocean liner RMS Lusitania in 1915.
All labels observed (1)
| Label | Occurrences |
|---|---|
| U-20 canonical | 3 |
How this entity was disambiguated
This entity first appeared as the object of triple T2144678 — 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: U-20 Context triple: [Imperial German Navy, notableShip, U-20]
-
A.
U-17
U-17 is a youth football age category for players under 17 years old, commonly used in international and domestic competitions.
-
B.
USSF-67
USSF-67 is a classified U.S. Space Force national security mission launched aboard a SpaceX Falcon Heavy rocket.
-
C.
U21
U21 is a global network of leading research-intensive universities that collaborate to enhance higher education and research through international partnerships and initiatives.
-
D.
USSF-44
USSF-44 is a classified U.S. Space Force national security mission launched on a Falcon Heavy rocket to deploy military payloads into geostationary orbit.
-
E.
U-28A Draco
The U-28A Draco is a U.S. Air Force special operations intelligence, surveillance, and reconnaissance aircraft based on the Pilatus PC-12 platform and used for tactical airborne ISR and support missions.
- 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: U-20 Target entity description: U-20 was a German World War I U-boat best known for sinking the British ocean liner RMS Lusitania in 1915.
-
A.
U-17
U-17 is a youth football age category for players under 17 years old, commonly used in international and domestic competitions.
-
B.
USSF-67
USSF-67 is a classified U.S. Space Force national security mission launched aboard a SpaceX Falcon Heavy rocket.
-
C.
U21
U21 is a global network of leading research-intensive universities that collaborate to enhance higher education and research through international partnerships and initiatives.
-
D.
USSF-44
USSF-44 is a classified U.S. Space Force national security mission launched on a Falcon Heavy rocket to deploy military payloads into geostationary orbit.
-
E.
U-28A Draco
The U-28A Draco is a U.S. Air Force special operations intelligence, surveillance, and reconnaissance aircraft based on the Pilatus PC-12 platform and used for tactical airborne ISR and support missions.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
German Type U 19 submarine
ⓘ
U-boat ⓘ military ship ⓘ |
| armament |
deck gun
ⓘ
torpedo tubes ⓘ |
| beam | 6.10 m ⓘ |
| builder | Kaiserliche Werft Danzig ⓘ |
| builtAt |
Danzig
ⓘ
linked to:
Gdańsk
|
| commandedBy | Walther Schwieger ⓘ |
| commissionedOn | 1913-08-05 ⓘ |
| conflict | World War I ⓘ |
| countryOfOrigin | German Empire ⓘ |
| crewComplement | about 35 ⓘ |
| dateOfLoss | 1916-11-05 ⓘ |
| deckGunCaliber | 8.8 cm ⓘ |
| displacementSubmerged | 837 t ⓘ |
| displacementSurfaced | 650 t ⓘ |
| draft | 3.60 m ⓘ |
| era | World War I naval warfare ⓘ |
| fate | grounded and destroyed ⓘ |
| hullNumber | U-20 ⓘ |
| knownFor | sinking RMS Lusitania ⓘ |
| launchedOn | 1912-12-18 ⓘ |
| length | 64.15 m ⓘ |
| locationDuringLusitaniaAttack | off the coast of Ireland ⓘ |
| maximumSpeedSubmerged | 9.5 kn ⓘ |
| maximumSpeedSurfaced | 15.4 kn ⓘ |
| navalEnsign | Imperial German war ensign ⓘ |
| notableConsequence |
Lusitania sinking contributed to shift in U.S. public opinion against Germany
ⓘ
linked to:
sinking of the RMS Lusitania
|
| notableEvent | torpedoed RMS Lusitania on 1915-05-07 ⓘ |
| operatedBy | Imperial German Navy ⓘ |
| operationalRole |
commerce raiding
ⓘ
submarine warfare against Allied shipping ⓘ |
| patrolArea |
Irish Sea
ⓘ
North Atlantic Ocean ⓘ
linked to:
Atlantic Ocean
North Sea ⓘ |
| placeOfLoss | near Vigsø, Jutland coast, Denmark ⓘ |
| propulsion |
diesel engines (surfaced)
ⓘ
electric motors (submerged) ⓘ |
| reasonForLoss | ran aground in bad weather ⓘ |
| scuttledBy | Imperial German Navy crew ⓘ |
| serviceEndYear | 1916 ⓘ |
| serviceStartYear | 1913 ⓘ |
| shipClass | Type U 19-class submarine ⓘ |
| shipType | submarine ⓘ |
| tonnageSunk | over 100,000 GRT ⓘ |
| torpedoTubes | 4 bow 50 cm tubes ⓘ |
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: U-20 Description of subject: U-20 was a German World War I U-boat best known for sinking the British ocean liner RMS Lusitania in 1915.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.