Sydney Harbour midget submarine attack
E750894
The Sydney Harbour midget submarine attack was a 1942 World War II raid in which Japanese midget submarines penetrated Sydney Harbour in an attempt to strike Allied naval vessels.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Sydney Harbour midget submarine attack canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T8698235 — 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: Sydney Harbour midget submarine attack Context triple: [Imperial Japanese Navy submarine force, notableOperation, Sydney Harbour midget submarine attack]
-
A.
Attack on Darwin
Attack on Darwin was a major World War II air raid by Japanese forces on the Australian town of Darwin in 1942, marking the largest single attack ever mounted by a foreign power on Australia.
-
B.
Arawe landings
The Arawe landings were a World War II amphibious assault by Allied forces on the southern coast of New Britain in December 1943, conducted to secure a foothold and divert Japanese attention from larger operations in the region.
-
C.
Second Battle of the Java Sea
The Second Battle of the Java Sea was a World War II naval engagement in early March 1942 in which Japanese forces decisively defeated retreating Allied ships near Java, completing their control over the Dutch East Indies.
-
D.
Battle of the Java Sea
The Battle of the Java Sea was a major World War II naval engagement in early 1942 in which Japanese forces decisively defeated an Allied fleet, leading to the fall of the Dutch East Indies.
-
E.
Indian Ocean raid
The Indian Ocean raid was a major World War II naval operation in April 1942 in which Japan’s fleet struck British and Allied forces in the Indian Ocean, aiming to weaken their naval presence and disrupt supply lines.
- 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: Sydney Harbour midget submarine attack Target entity description: The Sydney Harbour midget submarine attack was a 1942 World War II raid in which Japanese midget submarines penetrated Sydney Harbour in an attempt to strike Allied naval vessels.
-
A.
Attack on Darwin
Attack on Darwin was a major World War II air raid by Japanese forces on the Australian town of Darwin in 1942, marking the largest single attack ever mounted by a foreign power on Australia.
-
B.
Arawe landings
The Arawe landings were a World War II amphibious assault by Allied forces on the southern coast of New Britain in December 1943, conducted to secure a foothold and divert Japanese attention from larger operations in the region.
-
C.
Second Battle of the Java Sea
The Second Battle of the Java Sea was a World War II naval engagement in early March 1942 in which Japanese forces decisively defeated retreating Allied ships near Java, completing their control over the Dutch East Indies.
-
D.
Battle of the Java Sea
The Battle of the Java Sea was a major World War II naval engagement in early 1942 in which Japanese forces decisively defeated an Allied fleet, leading to the fall of the Dutch East Indies.
-
E.
Indian Ocean raid
The Indian Ocean raid was a major World War II naval operation in April 1942 in which Japan’s fleet struck British and Allied forces in the Indian Ocean, aiming to weaken their naval presence and disrupt supply lines.
- F. None of above. chosen
Statements (45)
| Predicate | Object |
|---|---|
| instanceOf |
military operation
ⓘ
naval battle ⓘ |
| alsoKnownAs |
Attack on Sydney Harbour
NERFINISHED
ⓘ
Sydney Harbour submarine attack NERFINISHED ⓘ |
| attacker | Imperial Japanese Navy NERFINISHED ⓘ |
| belligerent |
Australia
NERFINISHED
ⓘ
Japan ⓘ
surface form:
Empire of Japan
United States of America ⓘ
surface form:
United States
|
| casualties |
21 Allied sailors killed
ⓘ
4 Japanese submariners killed ⓘ |
| commemoratedBy |
exhibition of recovered midget submarine at the Australian War Memorial
ⓘ
memorials at Garden Island, Sydney ⓘ |
| conflict | World War II ⓘ |
| country | Australia ⓘ |
| countryOfEvent | Australia NERFINISHED ⓘ |
| date |
1 June 1942
ⓘ
31 May 1942 ⓘ |
| defender |
Royal Australian Navy
NERFINISHED
ⓘ
United States Navy NERFINISHED ⓘ |
| followedBy | Attack on Sydney by Japanese submarines (shelling of Sydney) in June 1942 NERFINISHED ⓘ |
| hasCause | Japanese strategy to disrupt Allied naval forces in the Pacific ⓘ |
| hasParticipant |
HMAS Kuttabul
NERFINISHED
ⓘ
Imperial Japanese Navy submarine I-22 (mother submarine) NERFINISHED ⓘ Imperial Japanese Navy submarine I-24 (mother submarine) NERFINISHED ⓘ Imperial Japanese Navy submarine I-27 (mother submarine) NERFINISHED ⓘ Royal Australian Navy patrol craft ⓘ USS Chicago NERFINISHED ⓘ |
| location |
Australia
NERFINISHED
ⓘ
Sydney Harbour NERFINISHED ⓘ Sydney, New South Wales NERFINISHED ⓘ |
| notableFor | Japanese midget submarines penetrating a major Allied harbour ⓘ |
| notableShipSunk | HMAS Kuttabul NERFINISHED ⓘ |
| numberOfSubmarinesUsed | 3 ⓘ |
| objective | to attack Allied warships in Sydney Harbour ⓘ |
| partOf | Pacific War ⓘ |
| result |
Allied victory
ⓘ
failure of Japanese raid ⓘ |
| strategicImpact | limited strategic effect on Allied naval operations ⓘ |
| subsequentEvent | recovery of two Japanese midget submarines from Sydney Harbour ⓘ |
| tacticalOutcome | one Allied accommodation ship sunk, no major warship damaged ⓘ |
| targetedShip | USS Chicago NERFINISHED ⓘ |
| theatreOfWar | South West Pacific theatre NERFINISHED ⓘ |
| typeOfOperation | covert naval raid ⓘ |
| usedWeapon | Type A Kō-hyōteki-class midget submarine NERFINISHED ⓘ |
| year | 1942 ⓘ |
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: Sydney Harbour midget submarine attack Description of subject: The Sydney Harbour midget submarine attack was a 1942 World War II raid in which Japanese midget submarines penetrated Sydney Harbour in an attempt to strike Allied naval vessels.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.
Imperial Japanese Navy submarine force
→
notableOperation
→
Sydney Harbour midget submarine attack
ⓘ