U-9
E242795
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.
All labels observed (2)
| Label | Occurrences |
|---|---|
| German U-boat U-20 | 1 |
| U-9 canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2144677 — 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-9 Context triple: [Imperial German Navy, notableShip, U-9]
-
A.
U-boats
U-boats were German military submarines, most famously used in both World Wars for commerce raiding and naval warfare in the Atlantic.
-
B.
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.
-
C.
U-505 submarine
The U-505 submarine is a captured German World War II U-boat preserved as a historic naval artifact and war prize.
-
D.
Admiral Graf Spee
Admiral Graf Spee was a German "pocket battleship" (heavy cruiser) of the Kriegsmarine famed for its commerce raiding in the South Atlantic and its scuttling after the Battle of the River Plate early in World War II.
-
E.
Tirpitz
Tirpitz was a German World War II battleship, sister ship to Bismarck, known for its powerful presence in Norwegian waters and the significant Allied efforts devoted to neutralizing it.
- 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-9 Target entity description: 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.
-
A.
U-boats
U-boats were German military submarines, most famously used in both World Wars for commerce raiding and naval warfare in the Atlantic.
-
B.
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.
-
C.
U-505 submarine
The U-505 submarine is a captured German World War II U-boat preserved as a historic naval artifact and war prize.
-
D.
Admiral Graf Spee
Admiral Graf Spee was a German "pocket battleship" (heavy cruiser) of the Kriegsmarine famed for its commerce raiding in the South Atlantic and its scuttling after the Battle of the River Plate early in World War II.
-
E.
Tirpitz
Tirpitz was a German World War II battleship, sister ship to Bismarck, known for its powerful presence in Norwegian waters and the significant Allied efforts devoted to neutralizing it.
- F. None of above. chosen
Statements (45)
| Predicate | Object |
|---|---|
| instanceOf |
German Type U 9 submarine
ⓘ
World War I U-boat ⓘ |
| armament |
Deck gun (added during service)
ⓘ
Torpedo tubes ⓘ |
| awarded | Iron Cross to the crew for the 22 September 1914 action ⓘ |
| builder | Kaiserliche Werft Danzig ⓘ |
| class | Type U 9-class submarine ⓘ |
| commander | Otto Weddigen ⓘ |
| commissioned | 18 April 1910 ⓘ |
| conflict | World War I ⓘ |
| country | German Empire ⓘ |
| crewComplement | About 4 officers and 31 enlisted men ⓘ |
| dateOfEvent | 22 September 1914 ⓘ |
| displacement |
Approximately 493 tons surfaced
ⓘ
Approximately 611 tons submerged ⓘ |
| era | Early 20th century ⓘ |
| fate |
Decommissioned after World War I
ⓘ
Scrapped in 1919 ⓘ |
| impact | Influenced naval strategy and convoy adoption in World War I ⓘ |
| laidDown | 1908 ⓘ |
| launched | 22 February 1910 ⓘ |
| length | Approximately 57 meters ⓘ |
| navalPrefix | SM ⓘ |
| navalPrefixMeaning | Seiner Majestät (His Majesty’s) ⓘ |
| notableEngagement | Action of 22 September 1914 ⓘ |
| notableFor |
Early successes in submarine warfare in World War I
ⓘ
Sinking three British armoured cruisers in a single engagement on 22 September 1914 ⓘ |
| notableOutcome | Demonstrated vulnerability of surface warships to submarines ⓘ |
| operator | Imperial German Navy ⓘ |
| partOf | High Seas Fleet ⓘ |
| patrolArea |
Atlantic Ocean
ⓘ
surface form:
North Atlantic
North Sea ⓘ |
| primaryWeapon | Torpedo ⓘ |
| propulsion | Diesel engines and electric motors ⓘ |
| role | Attack submarine ⓘ |
| sank |
HMS Aboukir
ⓘ
HMS Cressy ⓘ HMS Hogue ⓘ |
| serviceBranch |
Imperial German Navy
ⓘ
surface form:
Kaiserliche Marine
|
| serviceEntry | Pre-war Imperial German Navy ⓘ |
| shipClass | Type U 9-class submarine ⓘ |
| symbolicStatus | Early symbol of the effectiveness of submarine warfare ⓘ |
| technology | Early diesel-electric submarine design ⓘ |
| tonnageSunk | Over 36,000 tons on 22 September 1914 ⓘ |
| victoryType | Submarine torpedo attack ⓘ |
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-9 Description of subject: 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.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
German U-boat U-20