Operation Z
E25089
Operation Z was the Imperial Japanese Navy’s codename for the 1941 carrier-based attack plan on Pearl Harbor that launched Japan into war with the United States in World War II.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Operation Z canonical | 2 |
| Plan Z | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T58592 — 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: Operation Z Context triple: [Imperial Japanese Navy, notableOperation, Operation Z]
-
A.
Operation Koltso
Operation Koltso was the final Soviet offensive in early 1943 that encircled and destroyed the remaining German 6th Army at Stalingrad, effectively ending the battle.
-
B.
Operation Downfall
Operation Downfall was the Allied forces’ planned but never-executed invasion of the Japanese home islands near the end of World War II.
-
C.
Operation Crossbow
Operation Crossbow was a World War II Allied campaign of intelligence, bombing, and reconnaissance aimed at locating and destroying German V-weapon (V-1 and V-2) research, production, and launch sites.
-
D.
Operation Banner
Operation Banner was the British Army’s long-running military deployment in Northern Ireland during the Troubles, focused on counterinsurgency and internal security operations.
-
E.
Operation Vittles
Operation Vittles was the U.S. military’s codename for its large-scale air supply effort to deliver food, fuel, and other essentials to West Berlin during the Berlin Airlift of 1948–1949.
- 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: Operation Z Target entity description: Operation Z was the Imperial Japanese Navy’s codename for the 1941 carrier-based attack plan on Pearl Harbor that launched Japan into war with the United States in World War II.
-
A.
Operation Koltso
Operation Koltso was the final Soviet offensive in early 1943 that encircled and destroyed the remaining German 6th Army at Stalingrad, effectively ending the battle.
-
B.
Operation Downfall
Operation Downfall was the Allied forces’ planned but never-executed invasion of the Japanese home islands near the end of World War II.
-
C.
Operation Crossbow
Operation Crossbow was a World War II Allied campaign of intelligence, bombing, and reconnaissance aimed at locating and destroying German V-weapon (V-1 and V-2) research, production, and launch sites.
-
D.
Operation Banner
Operation Banner was the British Army’s long-running military deployment in Northern Ireland during the Troubles, focused on counterinsurgency and internal security operations.
-
E.
Operation Vittles
Operation Vittles was the U.S. military’s codename for its large-scale air supply effort to deliver food, fuel, and other essentials to West Berlin during the Berlin Airlift of 1948–1949.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
codename
ⓘ
military operation ⓘ naval operation ⓘ |
| alsoKnownAs |
Operation Z
ⓘ
surface form:
Plan Z
|
| characteristic |
preemptive strike
ⓘ
surprise attack ⓘ |
| commandedBy | Chuichi Nagumo ⓘ |
| conflict | World War II ⓘ |
| consequence |
attack on Pearl Harbor
ⓘ
surface form:
United States declaration of war on Japan
brought the United States into World War II ⓘ escalation of the Pacific War ⓘ |
| country |
Japan
ⓘ
surface form:
Empire of Japan
|
| executedBy | Kido Butai ⓘ |
| goal |
achieve strategic surprise
ⓘ
cripple the U.S. Pacific Fleet ⓘ secure Japanese freedom of action in the Pacific ⓘ |
| hasPart | attack on Pearl Harbor ⓘ |
| historicalPeriod | 20th century ⓘ |
| involves |
Akagi
ⓘ
Hiryu ⓘ Kaga ⓘ Shokaku ⓘ Sōryū ⓘ
surface form:
Soryu
Zuikaku ⓘ |
| languageOfCodename | Japanese ⓘ |
| legalStatus | undeclared act of war ⓘ |
| location |
Hawaii
ⓘ
Oahu ⓘ Pearl Harbor (interwar and early WWII) ⓘ
surface form:
Pearl Harbor
|
| natureOfAttack | carrier-based air attack ⓘ |
| operator | Imperial Japanese Navy ⓘ |
| partOf | Pacific War ⓘ |
| plannedAt |
Combined Fleet
ⓘ
surface form:
Combined Fleet headquarters
|
| plannedBy |
Isoroku Yamamoto
ⓘ
Minoru Genda ⓘ |
| result |
strategic failure for Japan in the long term
ⓘ
tactical Japanese victory ⓘ |
| startTime | 1941-12-07 ⓘ |
| target |
Pearl Harbor Naval Shipyard
ⓘ
surface form:
Pearl Harbor naval base
United States Navy ⓘ U.S. Pacific Fleet ⓘ
surface form:
United States Pacific Fleet
|
| temporalContext | 1941 ⓘ |
| uses |
aircraft carriers
ⓘ
carrier-based aircraft ⓘ dive bombers ⓘ fighter aircraft ⓘ level bombers ⓘ torpedo bombers ⓘ |
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: Operation Z Description of subject: Operation Z was the Imperial Japanese Navy’s codename for the 1941 carrier-based attack plan on Pearl Harbor that launched Japan into war with the United States in World War II.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Plan Z