There were 2 battles near Manassas Junction,so you need to indicate which one you mean. The first one was on July 21,1861. The second one was August 29-30 of 1862.
First Bull Run (Manassas)
The Confederates were led by Robert E. Lee and Stonewall Jackson.
Union (The North) forces called the Battle of Manassas the Battle of Bull Run .
The events were that there was a battle of Concord.
August 29-30, 1862 was the date for the Second Battle of Manassas. The First Battle of Manassas was fought July 21, 1861.
Joseph Johnston and P.G.T. Beauregard led the Confederate Army at the battle of First Manassas also called First Bull Run and won.
Battle of Manassas Gap happened on 1863-07-23.
Manassas Junction, Virginia.
The First Battle of Manassas was caused by the pressure of the public opinion of both sides, who wanted to solve the conflict by means of a single great battle, that would have led to the annihilation of the adversary and the seize of the enemy's Capital. But it was not to be, because of both armies were not fit enough for the purpose.
First and Second Battle of Manassas (named after the nearby creek)
The Battle of First Manassas (also known as the First Battle of Bull Run) started on July 21, 1861. The Battle of Second Manassas (also known as the Second Battle of Bull Run) began on August 28, 1862.
The battlefield of Manassas is in the state of Virginia.