Battle of Osan
E825548
The Battle of Osan was the first significant engagement between United States and North Korean forces in the Korean War, marking the initial American ground combat of the conflict in July 1950.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Battle of Osan canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T9818765 — 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: Battle of Osan Context triple: [24th Infantry Division (United States), battle, Battle of Osan]
-
A.
Battle of Taejon
The Battle of Taejon was a key early engagement of the Korean War in July 1950, where outnumbered U.S. forces attempted to delay the advancing North Korean army before the defense of the Pusan Perimeter.
-
B.
Battle of Wonju
The Battle of Wonju was a key engagement of the Korean War in early 1951, where United Nations forces halted Chinese and North Korean advances in central South Korea.
-
C.
Battle of Chipyong-ni
The Battle of Chipyong-ni was a pivotal Korean War engagement in February 1951 where United Nations forces, including U.S. and French units, successfully withstood and repelled large-scale Chinese attacks, marking a turning point in the conflict.
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D.
Battle of Seonghwan
The Battle of Seonghwan was an early land engagement in 1894 during the First Sino-Japanese War in which Japanese forces defeated Chinese troops near Asan in Korea, helping secure Japanese control over the Korean Peninsula.
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E.
Battle of Pyongyang
The Battle of Pyongyang was a major 1894 land engagement in Korea during the First Sino-Japanese War, where Japanese forces decisively defeated Qing Chinese troops, helping to secure Japanese control over the Korean Peninsula.
- 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: Battle of Osan Target entity description: The Battle of Osan was the first significant engagement between United States and North Korean forces in the Korean War, marking the initial American ground combat of the conflict in July 1950.
-
A.
Battle of Taejon
The Battle of Taejon was a key early engagement of the Korean War in July 1950, where outnumbered U.S. forces attempted to delay the advancing North Korean army before the defense of the Pusan Perimeter.
-
B.
Battle of Wonju
The Battle of Wonju was a key engagement of the Korean War in early 1951, where United Nations forces halted Chinese and North Korean advances in central South Korea.
-
C.
Battle of Chipyong-ni
The Battle of Chipyong-ni was a pivotal Korean War engagement in February 1951 where United Nations forces, including U.S. and French units, successfully withstood and repelled large-scale Chinese attacks, marking a turning point in the conflict.
-
D.
Battle of Seonghwan
The Battle of Seonghwan was an early land engagement in 1894 during the First Sino-Japanese War in which Japanese forces defeated Chinese troops near Asan in Korea, helping secure Japanese control over the Korean Peninsula.
-
E.
Battle of Pyongyang
The Battle of Pyongyang was a major 1894 land engagement in Korea during the First Sino-Japanese War, where Japanese forces decisively defeated Qing Chinese troops, helping to secure Japanese control over the Korean Peninsula.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
battle
ⓘ
military engagement ⓘ |
| airSupport | limited U.S. air support ⓘ |
| alsoKnownAs | Action at Osan ⓘ |
| belligerent |
North Korea
ⓘ
United States ⓘ
linked to:
United States of America
|
| commander |
Charles B. Smith
ⓘ
Choe Hyon ⓘ |
| conflict | Korean War ⓘ |
| country | South Korea ⓘ |
| date | 1950-07-05 ⓘ |
| endDate | 1950-07-05 ⓘ |
| era | Cold War ⓘ |
| followedBy |
Battle of Chonan
ⓘ
Battle of Pyongtaek ⓘ |
| front | Korean Peninsula ⓘ |
| geographicalContext | near Osan, Gyeonggi Province, South Korea ⓘ |
| locationRelativeToSeoul | south of Seoul ⓘ |
| NKArmorStrength | approximately 33 T-34 tanks ⓘ |
| NKArmorType |
T-34-85 tanks
ⓘ
linked to:
T-34 medium tank
|
| NKCasualtiesAndLosses | unknown ⓘ |
| NKStrength | several thousand soldiers ⓘ |
| NKUnit |
105th Armored Division (North Korea)
ⓘ
4th Infantry Division (North Korea) ⓘ
linked to:
Korean People's Army 4th Division
|
| notableFor | demonstrating inadequacy of lightly armed US forces against North Korean armor early in the war ⓘ |
| objective | delay North Korean advance toward Suwon and Taejon ⓘ |
| outcome | North Korean tactical victory ⓘ |
| partOf | Korean War ⓘ |
| place | Osan, South Korea ⓘ |
| precededBy |
North Korean invasion of South Korea
ⓘ
linked to:
North Korean advance across South Korea
|
| result | North Korean victory ⓘ |
| side | United Nations forces ⓘ |
| startDate | 1950-07-05 ⓘ |
| strategicSignificance |
first American ground combat of the Korean War
ⓘ
first engagement between United States and North Korean ground forces in the Korean War ⓘ |
| tacticalGoalUS | delay North Korean forces until additional UN troops could arrive ⓘ |
| UNMember |
United States
ⓘ
linked to:
United States of America
|
| USAntiTankWeapons |
2.36-inch bazookas
ⓘ
75 mm recoilless rifles ⓘ |
| USArtillery | 105 mm howitzers ⓘ |
| USCasualtiesAndLosses |
about 150 missing
ⓘ
about 21 wounded ⓘ about 60 killed ⓘ about 82 captured ⓘ |
| USStrength | about 540 soldiers ⓘ |
| USUnit |
24th Infantry Division (United States)
ⓘ
Task Force Smith ⓘ |
| year | 1950 ⓘ |
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: Battle of Osan Description of subject: The Battle of Osan was the first significant engagement between United States and North Korean forces in the Korean War, marking the initial American ground combat of the conflict in July 1950.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.