General Irwin McDowell.
He commanded the losing Union forces.
The commanders for the Confederates were General Joseph E. Johnston and Brigadier General Pierre Beauregard at First Bull Run. The Union army was commanded by Brigadier General Irvin McDowell.
Confederate General PT Beauregard commanded the Army of the Potomac and General Joseph Johnston commanded the Army of the Shenandoah at the first Battle of Bull Run.
"Stonewall" Jackson
A Union victory was expected at the first Battle of Bull Run. It was indeed a shock to have suffered a defeat.
The Confederacy won both the Battles of Bull Run (Manassas). In the first, they were commanded by Joseph E. Johnston, against the Union army under Irvin McDowall. In the second, they were commanded by Robert E. Lee, against the Union army under John Pope.
The Union caled it Bull Run.
First Battle of Bull RunSecond Battle of Bull RunIvrin was part of the Union
the north (union)
First Bull Run (Manassas) - Union army commanded by Irvin McDowell, Confederates by Joseph E. Johnston, who ceded some of the authority to P.G.T. Beauregard on account on the latter's superior knowledge of the terrain. Second Bull Run (Manassas) - Union army commanded by John Pope, Confederates by Robert E. Lee, assisted by T.J. 'Stonewall' Jackson.
The Union was attacked by the Confederates first, starting the Battle of Bull Run. :)
The First Battle of Bull Run