First Battle of Bull Run
Overview
 
First Battle of Bull Run, also known as First Manassas (the name used by Confederate forces), was fought on July 21, 1861, in Prince William County, Virginia
Prince William County, Virginia
-National protected areas:* Featherstone National Wildlife Refuge* Manassas National Battlefield Park* Occoquan Bay National Wildlife Refuge* Prince William Forest Park-Government and politics:...

, near the City of Manassas
Manassas, Virginia
The City of Manassas is an independent city surrounded by Prince William County and the independent city of Manassas Park in the Commonwealth of Virginia in the United States. Its population was 37,821 as of 2010. Manassas also surrounds the county seat for Prince William County but that county...

. It was the first major land battle of the American Civil War
American Civil War
The American Civil War was a civil war fought in the United States of America. In response to the election of Abraham Lincoln as President of the United States, 11 southern slave states declared their secession from the United States and formed the Confederate States of America ; the other 25...

.

Just months after the start of the war at Fort Sumter
Battle of Fort Sumter
The Battle of Fort Sumter was the bombardment and surrender of Fort Sumter, near Charleston, South Carolina, that started the American Civil War. Following declarations of secession by seven Southern states, South Carolina demanded that the U.S. Army abandon its facilities in Charleston Harbor. On...

, the Northern
Northern United States
Northern United States, also sometimes the North, may refer to:* A particular grouping of states or regions of the United States of America. The United States Census Bureau divides some of the northernmost United States into the Midwest Region and the Northeast Region...

 public clamored for a march against the Confederate
Confederate States of America
The Confederate States of America was a government set up from 1861 to 1865 by 11 Southern slave states of the United States of America that had declared their secession from the U.S...

 capital of Richmond, Virginia
Richmond, Virginia
Richmond is the capital of the Commonwealth of Virginia, in the United States. It is an independent city and not part of any county. Richmond is the center of the Richmond Metropolitan Statistical Area and the Greater Richmond area...

, which could bring an early end to the war. Yielding to this political pressure, unseasoned Union Army
Union Army
The Union Army was the land force that fought for the Union during the American Civil War. It was also known as the Federal Army, the U.S. Army, the Northern Army and the National Army...

 troops under Brig. Gen.
Brigadier general (United States)
A brigadier general in the United States Army, Air Force, and Marine Corps, is a one-star general officer, with the pay grade of O-7. Brigadier general ranks above a colonel and below major general. Brigadier general is equivalent to the rank of rear admiral in the other uniformed...

 Irvin McDowell
Irvin McDowell
Irvin McDowell was a career American army officer. He is best known for his defeat in the First Battle of Bull Run, the first large-scale battle of the American Civil War.-Early life:...

 advanced across Bull Run
Bull Run (Occoquan River)
Bull Run is a free-flowing tributary stream of the Potomac River that originates from a spring in the Bull Run Mountains in Loudoun County, Virginia, and flows south to the Occoquan River...

 against the equally unseasoned Confederate Army under Brig.
 
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