Confederate General Robert E. Lee deals a stinging defeat to Union General John Pope at the Second Battle of Bull Run, Virginia—a battle that arose out of the failure of Union General George McClellan’s Peninsular campaign earlier in the summer. Frustrated with McClellan, who was still camped on the James Peninsula southeast of Richmond, President Abraham Lincoln and General-in-Chief Henry Halleck decided to pull a substantial part of McClellan’s Army of the Potomac and send it to General John Pope’s newly formed Army of Virginia.
Lee correctly guessed that McClellan had no plans to attack Richmond, so he sent General Thomas J. “Stonewall” Jackson north to keep an eye on Pope’s force. When it became clear that the Yankees were abandoning the peninsula, Lee moved more of his force northward to defeat Pope before reinforcements arrived.