First Battle of Bull Run
E23741
The First Battle of Bull Run was the opening major land battle of the American Civil War, resulting in a Confederate victory and shattering early illusions of a quick and easy conflict.
All labels observed (5)
| Label | Occurrences |
|---|---|
| First Battle of Bull Run canonical | 52 |
| First Battle of Manassas | 9 |
| Battle of Bull Run | 5 |
| Battle of First Bull Run | 1 |
| First Battle of Bull Run battlefield | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T51319 — 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: First Battle of Bull Run Context triple: [American Civil War, hasPart, First Battle of Bull Run]
-
A.
Battle of Bunker Hill
The Battle of Bunker Hill was a pivotal early engagement of the American Revolutionary War in June 1775, demonstrating that colonial forces could mount a strong resistance against the British despite ultimately losing the ground.
-
B.
Battle of Bladensburg
The Battle of Bladensburg was an 1814 War of 1812 engagement near Washington, D.C., in which British forces routed American defenders, opening the way for the subsequent burning of the U.S. capital.
-
C.
Battles of Lexington and Concord
The Battles of Lexington and Concord were the opening military engagements of the American Revolutionary War, marking the start of armed conflict between Great Britain and its thirteen American colonies in April 1775.
-
D.
Battle of Baltimore
The Battle of Baltimore was a key War of 1812 engagement in which American forces successfully defended the city and Fort McHenry from British attack, inspiring the lyrics of the United States national anthem.
-
E.
Battle of Princeton
The Battle of Princeton was a pivotal 1777 American Revolutionary War engagement in New Jersey where George Washington’s Continental Army defeated British forces, boosting Patriot morale and solidifying the momentum gained after Trenton.
- 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: First Battle of Bull Run Target entity description: The First Battle of Bull Run was the opening major land battle of the American Civil War, resulting in a Confederate victory and shattering early illusions of a quick and easy conflict.
-
A.
Battle of Bunker Hill
The Battle of Bunker Hill was a pivotal early engagement of the American Revolutionary War in June 1775, demonstrating that colonial forces could mount a strong resistance against the British despite ultimately losing the ground.
-
B.
Battle of Bladensburg
The Battle of Bladensburg was an 1814 War of 1812 engagement near Washington, D.C., in which British forces routed American defenders, opening the way for the subsequent burning of the U.S. capital.
-
C.
Battles of Lexington and Concord
The Battles of Lexington and Concord were the opening military engagements of the American Revolutionary War, marking the start of armed conflict between Great Britain and its thirteen American colonies in April 1775.
-
D.
Battle of Baltimore
The Battle of Baltimore was a key War of 1812 engagement in which American forces successfully defended the city and Fort McHenry from British attack, inspiring the lyrics of the United States national anthem.
-
E.
Battle of Princeton
The Battle of Princeton was a pivotal 1777 American Revolutionary War engagement in New Jersey where George Washington’s Continental Army defeated British forces, boosting Patriot morale and solidifying the momentum gained after Trenton.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
American Civil War battle
ⓘ
battle ⓘ land battle ⓘ |
| alsoKnownAs |
Manassas Campaign
ⓘ
surface form:
First Manassas
|
| belligerent |
Confederate States of America
ⓘ
United States of America ⓘ
surface form:
United States of America (Union)
|
| campaign | Manassas Campaign ⓘ |
| casualtiesAndLossesApproximate |
about 1,750 Confederate casualties
ⓘ
about 2,950 Union casualties ⓘ |
| civilianImpact | presence of civilian spectators from Washington, D.C. ⓘ |
| commander |
Irvin McDowell
ⓘ
Joseph E. Johnston ⓘ Brigadier General P. G. T. Beauregard ⓘ
surface form:
P. G. T. Beauregard
|
| commanderSide |
Irvin McDowell – Union
ⓘ
Joseph E. Johnston ⓘ
surface form:
Joseph E. Johnston – Confederacy
Brigadier General P. G. T. Beauregard ⓘ
surface form:
P. G. T. Beauregard – Confederacy
|
| conflictIn | American Civil War ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| date | July 21, 1861 ⓘ |
| followedBy | Union army reorganization under George B. McClellan ⓘ |
| front |
Eastern Theater of the American Civil War
ⓘ
surface form:
Eastern Front of the American Civil War
|
| killedApproximate |
about 390 Confederate soldiers killed
ⓘ
about 460 Union soldiers killed ⓘ |
| legacy | origin of the nickname "Stonewall" for Thomas J. Jackson ⓘ |
| location |
Prince William County, Virginia
ⓘ
near Manassas, Virginia ⓘ |
| nearTown |
Manassas
ⓘ
surface form:
Manassas Junction
|
| nicknameOriginDetail | Jackson reportedly stood like a stone wall during the battle ⓘ |
| notableFigure |
Stonewall Jackson
ⓘ
surface form:
Thomas J. Jackson
|
| partOf | Eastern Theater of the American Civil War ⓘ |
| politicalImpact |
convinced many that the war would be long and costly
ⓘ
led to increased calls in the North for a larger, better-trained army ⓘ |
| precededBy | Union advance from Washington, D.C. ⓘ |
| primaryObjectiveConfederate | to defend Manassas Junction and block Union advance on Richmond ⓘ |
| primaryObjectiveUnion | to strike the Confederate army at Manassas and open the way to Richmond ⓘ |
| result | Confederate victory ⓘ |
| riverNearby | Bull Run ⓘ |
| significance |
boosted Confederate morale
ⓘ
demonstrated need for better training and organization on both sides ⓘ first major land battle of the American Civil War ⓘ shattered Northern illusions of a quick war ⓘ |
| state | Virginia ⓘ |
| strengthApproximate |
about 32,000 Confederate troops engaged
ⓘ
about 35,000 Union troops engaged ⓘ |
| theater |
Eastern Theater of the American Civil War
ⓘ
surface form:
Virginia theater of operations
|
| woundedApproximate |
about 1,100 Union soldiers wounded
ⓘ
about 1,600 Confederate soldiers wounded ⓘ |
| year | 1861 ⓘ |
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: First Battle of Bull Run Description of subject: The First Battle of Bull Run was the opening major land battle of the American Civil War, resulting in a Confederate victory and shattering early illusions of a quick and easy conflict.
Referenced by (68)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Ambrose E. Burnside
subject surface form:
Robert Toombs
subject surface form:
Maxcy Gregg
this entity surface form:
First Battle of Manassas
this entity surface form:
First Battle of Manassas
this entity surface form:
Battle of Bull Run