Sydney Harbour midget submarine attack

E750894

military operation naval battle

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.

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All labels observed (3)

Label	Occurrences
Attack on Sydney Harbour	1
Sydney Harbour midget submarine attack canonical	1
Sydney Harbour submarine attack	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 ⓘ linked to: Sydney Harbour midget submarine attack Sydney Harbour submarine attack ⓘ linked to: Sydney Harbour midget submarine attack
attacker	Imperial Japanese Navy ⓘ
belligerent	Australia ⓘ Empire of Japan ⓘ linked to: Japan United States ⓘ linked to: United States of America
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 ⓘ
date	1 June 1942 ⓘ 31 May 1942 ⓘ
defender	Royal Australian Navy ⓘ United States Navy ⓘ
followedBy	Attack on Sydney by Japanese submarines (shelling of Sydney) in June 1942 ⓘ
hasCause	Japanese strategy to disrupt Allied naval forces in the Pacific ⓘ
hasParticipant	HMAS Kuttabul ⓘ Imperial Japanese Navy submarine I-22 (mother submarine) ⓘ Imperial Japanese Navy submarine I-24 (mother submarine) ⓘ Imperial Japanese Navy submarine I-27 (mother submarine) ⓘ linked to: Imperial Japanese Navy submarine I-22 (mother submarine) Royal Australian Navy patrol craft ⓘ USS Chicago ⓘ
location	Australia ⓘ Sydney Harbour ⓘ Sydney, New South Wales ⓘ linked to: Sydney, New South Wales, Australia
notableFor	Japanese midget submarines penetrating a major Allied harbour ⓘ
notableShipSunk	HMAS Kuttabul ⓘ
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 ⓘ
theatreOfWar	South West Pacific theatre ⓘ linked to: Southwest Pacific theatre of World War II
typeOfOperation	covert naval raid ⓘ
usedWeapon	Type A Kō-hyōteki-class midget submarine ⓘ
year	1942 ⓘ

How these facts were elicited

Referenced by (3)

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 ⓘ

Sydney Harbour midget submarine attack → alsoKnownAs → Attack on Sydney Harbour ⓘ

linked to: Sydney Harbour midget submarine attack

Sydney Harbour midget submarine attack → alsoKnownAs → Sydney Harbour submarine attack ⓘ