I think it was Stonewall Jackson you might get a better answer from someone else.
George McLellan
Irvin McDowell
The commander of the Union Army at First Bull Run (First Manassas) was Major General Irvin McDowell.
Irvin McDowell - an unlucky General, who knew that his army was not ready for operations, but was pushed into it by politicians ans the press.
On the field it was Irwin McDowell.
The Union commander was General McDowell. The Confederate commander was General Beuregard.
Major General George B. McClellan replaced Brigadier General Irvin McDowell as commander of the Army of Northeastern Virginia on July 26th, 1861. This army was to eventually become the Army of the Potomac.
Brigadier General Irvin McDowell
First Bull Run - Irvin McDowell Second Bull Run - John Pope
First Bull Run - Irvin McDowell Second Bull Run - John Pope
The Confederate Army provided reinforcements via railroad, thus overwhelming the Union Army.
The Union commander for the Second Battle of Bull Run (referred to as the Second Battle of Manassas in the South) was Major General John Pope.