Operation Detachment
E26156
Operation Detachment was the U.S. amphibious assault campaign in World War II aimed at capturing the strategically vital island of Iwo Jima from Japan.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Operation Detachment canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T88973 — 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 Detachment Context triple: [Battle of Iwo Jima, operationName, Operation Detachment]
-
A.
Operation Z
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.
-
B.
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.
-
C.
Operation Anadyr
Operation Anadyr was the secret Soviet military plan in 1962 to deploy nuclear missiles and other forces to Cuba, triggering the Cuban Missile Crisis.
-
D.
Operation Granby
Operation Granby was the codename for the United Kingdom’s military campaign during the 1990–1991 Gulf War against Iraq.
-
E.
Operation Blue
Operation Blue was the German Wehrmacht’s major 1942 summer offensive on the Eastern Front aimed at capturing the Soviet Union’s southern oil fields and securing strategic positions in the Caucasus.
- 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 Detachment Target entity description: Operation Detachment was the U.S. amphibious assault campaign in World War II aimed at capturing the strategically vital island of Iwo Jima from Japan.
-
A.
Operation Z
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.
-
B.
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.
-
C.
Operation Anadyr
Operation Anadyr was the secret Soviet military plan in 1962 to deploy nuclear missiles and other forces to Cuba, triggering the Cuban Missile Crisis.
-
D.
Operation Granby
Operation Granby was the codename for the United Kingdom’s military campaign during the 1990–1991 Gulf War against Iraq.
-
E.
Operation Blue
Operation Blue was the German Wehrmacht’s major 1942 summer offensive on the Eastern Front aimed at capturing the Soviet Union’s southern oil fields and securing strategic positions in the Caucasus.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
World War II battle
ⓘ
amphibious assault ⓘ military operation ⓘ |
| associatedWith |
Raising the Flag on Iwo Jima
ⓘ
surface form:
Raising the Flag on Iwo Jima photograph
|
| belligerent |
Japan
ⓘ
surface form:
Empire of Japan
United States of America ⓘ
surface form:
United States
|
| casualties |
high U.S. casualties
ⓘ
very high Japanese casualties ⓘ |
| codeName | Operation Detachment self-link ⓘ |
| commander |
Chester W. Nimitz
ⓘ
Holland M. Smith ⓘ Tadamichi Kuribayashi ⓘ |
| conflict | Battle of Iwo Jima ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| datePrecision | day ⓘ |
| defensiveDoctrine | Japanese defense-in-depth ⓘ |
| endDate | 1945-03-26 ⓘ |
| followedBy | Battle of Okinawa ⓘ |
| forceType |
United States Army Air Forces
ⓘ
United States Marine Corps ⓘ United States Navy ⓘ |
| isPartOfCampaign | U.S. island-hopping campaign ⓘ |
| location |
Iwo Jima
ⓘ
Pacific Ocean ⓘ Volcano Islands ⓘ |
| notableFeature |
extensive tunnel system
ⓘ
heavy Japanese fortifications ⓘ iconic flag raising on Mount Suribachi ⓘ |
| objective |
capture Iwo Jima
ⓘ
provide emergency landing fields for B-29 bombers ⓘ secure airfields on Iwo Jima ⓘ |
| opponent |
Imperial Japanese Army
ⓘ
Imperial Japanese Navy ⓘ |
| partOf |
Pacific War
ⓘ
World War II ⓘ |
| precededBy |
Battle of the Philippines (1944–1945)
ⓘ
surface form:
Philippines campaign (1944–1945)
|
| result | United States victory ⓘ |
| startDate | 1945-02-19 ⓘ |
| strategicImportance |
air support base for bombing Japan
ⓘ
proximity to Japanese home islands ⓘ |
| tactics |
amphibious landing
ⓘ
close air support ⓘ naval bombardment ⓘ |
| terrain |
black sand beaches
ⓘ
volcanic island ⓘ |
| theater |
Pacific theater commands
ⓘ
surface form:
Pacific Theater of Operations
|
| year | 1945 ⓘ |
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 Detachment Description of subject: Operation Detachment was the U.S. amphibious assault campaign in World War II aimed at capturing the strategically vital island of Iwo Jima from Japan.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.