On the field it was Irwin McDowell.
First Bull Run - Irvin McDowell Second Bull Run - John Pope
First Bull Run - Irvin McDowell Second Bull Run - John Pope
Irvin McDowell
For the First Bull Run, the Union commander was Major General Irvin McDowell. For the Second Bull Run, Major General John Pope led the Union armies.
George McLellan
The commander of the Union Army at First Bull Run (First Manassas) was Major General Irvin McDowell.
The Union commander was General McDowell. The Confederate commander was General Beuregard.
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.
Brigadier General Irvin McDowell
General John Pope.
The Confederates (The South) won both the battles of Bull Run (or Manassas, as the South likes to call them.)The first was won by Joseph E. Johnston and P.G.T. Beauregard, over the Union commander Irvin McDowell.The second was won by Robert E. Lee and T.J. ("Stonewall") Jackson, over the Union commander John Pope.The Confederates - both times.
A Union victory was expected at the first Battle of Bull Run. It was indeed a shock to have suffered a defeat.