There were two battle of Bull Run/Manassas so it pays to be specific.
The First Battle of Bull Run/Manassas was fought between the Federal Army of Northwestern Virginia under the command of Irvin McDowell against the Confederate Army of the Potomac under the command of P.G.T. Beauregard and the Army of the Shenandoah under the command of Joseph E. Johnston.
The Second Battle of Bull Run/Manassas was fought between the Federal Army of Virginia under the command of John Pope and the Army of Northern Vrginia under the command of Robert E. Lee.
Both battles were Confederate Victories.
At the First Battle of Bull Run, Southern forces were led by generals Beauregard and Johnston. At the Second Battle of Bull Run, the commanding officer of all Southern forces was General Robert E. Lee.
John Pope led Union forces whereas Robert E. Lee led Confederate forces .
First Battle of Bull Run - 32-34,000 Second Battle of Bull Run - 50,000
The second battle of Bull Run was another Bull Run victory for the Confederacy. General Lee drove the Union forces out of Virginia as a result of his victory in the 2nd Bull Run.
Things that led up to the bull run was the battle at Fort Sumter
what forces were engaged
Union (The North) forces called the Battle of Manassas the Battle of Bull Run .
General Irvin McDowell.
P.G.T Beauregard
As the outcome of the battle led to the evacuation of the whole Northern Virginia by the US forces it was a decisive tactical and strategical success for the Confederates
One of the first major battles in the civil war was the battle at bull run.
During the Second Battle of Bull Run, General John Pope was sent to command the Union forces in northern Virginia. His troops were positioned to engage the Confederate army, led by General Robert E. Lee. The battle took place from August 28 to August 30, 1862, and ultimately resulted in a significant defeat for Pope's forces. This loss led to his dismissal from command shortly afterward.