Don Carlos Buell receives orders to turn his Federal command over to William S. Rosecrans for his failure to stop the Confederates’ escape from Kentucky and his refusal to chase them into eastern Tennessee.
The right wing of Robert E. Lee’s Confederate army rips into John Pope’s Federals and nearly destroys his Army of Virginia in the decisive fight of the Second Bull Run campaign.
Thomas “Stonewall” Jackson’s Confederates attack a portion of John Pope’s Federal Army of Virginia northwest of Manassas Junction and spark a major battle in northern Virginia.
Abraham Lincoln orders the drafting of militia into the Federal armies and allows for the recruitment of blacks as military combatants for the first time.
Abraham Lincoln surprises his cabinet by reading a draft of an executive order freeing all slaves in Confederate states.
The lack of southern opposition in the U.S. Congress enables the Republican majority to enact most of its party agenda.