The First Battle of Bull Run was the first major battle of the Civil War.
General Irvin Mcdowell led the Union troops and General P.G.T Beauregard led the Confederates.
By July 1861, two months after Confederate troops opened fire on Fort Sumter to begin the Civil War, the northern press and public were eager for the Union Army to make an advance on Richmond ahead of the planned meeting of the Confederate Congress there on July 20.
The Union's forces were slow in positioning themselves, allowing Confederate reinforcements time to arrive by rail. Each side had about 18,000 poorly trained and poorly led troops in their first battle.
The battle took place in Manassas, Virginia
It was Confederate victory because of the Union being slow to positioning themselves it gave the confederates an advantage.