1st Battle of Bull run

The first major battle of the Civil War was fought in Virginia, near the Manassas, Virginia railway junction, after which the battle is called (or First Bull Run, named after the flowing stream on the battlefield, if of the Union persuasion). The armies in this first battle were not very large by later Civil War standards. The Federal forces under Brigadier General Irvin McDowell were organized into four divisions (five, if one includes Runyan's division), of about 30,000 men. These divisions were commanded by Tyler, Hunter, Heintzelman, (Runyan), and Miles. The Confederate command structure was somewhat more unwieldy, including two "armies", with no division structure and thirteen independent brigades under Bonham, Ewell, Jones, Longstreet, Cocke, Early, Holmes, Kershaw, Evans, Jackson, Bartow, Bee, Smith, and a cavalry brigade under Stuart. The Confederate Army of the Potomac was under the command of Brigadier General Pierre G. T. Beauregard, and the Army of the Shenandoah was commanded by Brigadier General Joseph E. Johnston. These two forces would equal McDowell's strength.

Interestingly enough, each commander had planned to initiate an attack on the other side with a feint attack on the enemy's right flank and a massed attack on the opposite flank. Had this been done simultaneously, and both been successful in their purpose, the two armies would have simply pivoted around each other and ended up in each other's rear, able to march unopposed to Washington or Richmond, as the case may be. As it turned out, the general least successful in initiating this movement was the winner.

McDowell had planned to use Tyler's division as the diversionary attack at the Stone Bridge, while Davies' brigade did the same at Blackburn's Ford. At the same time, Hunter's and Heintzelman's divisions would cross Bull Run at Sudley Springs and attack from the north.

McDowell's green troops involved in the flanking column, reached their jumping off positions two and a half hours behind schedule. Tyler's and Davies' attacks at the Stone Bridge and Blackburn's Ford were already well under way, and the Confederate high command was beginning to sense a ruse because the Union attacks were not pressed very hard. When Beauregard was notified that Federal troops were massing on his left flank, he realized that this must be the main attack so began to shift his own troop dispositions.

The Federals had about 18,000 men in the main attack column and it was only thanks to the quick reactions of Colonel "Shank" Evans and his small brigade that Beauregard did not suffer a major disaster.