Be … auregard, 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 won the first battle of Bull Run at Manassas in  the Civil War.  The union tried there hardest but were unable to win.  The second was won by Robert E. Lee and T.J. (Stonewall) Jackson,  over the Union commander John Pope.   The Confederates won the first battle of Bull Run at Manassas in  the Civil War.   The union tried there hardest but were unable to win.