General George B. McClellan
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General McDowell was the first commanding officer of the Union's Army of the Potomac. Under him the Army lost it's first major battle, the battle of Manassas or Bull Run. He was quickly replaced with General George B. McClellan.
battle of bull run
The left side
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.
The Union commander was General McDowell. The Confederate commander was General Beuregard.