The Battle of Chantilly (or Ox Hill, the Confederate name) took place on September 1, 1862, in Fairfax County, Virginia, as the concluding battle of the Northern Virginia Campaign of the American Civil War. Thomas J. "Stonewall" Jackson's corps of the Army of Northern Virginia attempted to cut off the line of retreat of the Union Army of Virginia following the Second Battle of Bull Run, but was attacked by two Union divisions. During the ensuing battle, Union division commanders Isaac Stevens and Philip Kearny were both killed, but the Union attack halted Jackson's advance.
Defeated in the Second Battle of Bull Run on August 30, Union Maj. Gen. John Pope ordered his Army of Virginia to retreat to Centreville. The movement began after dark, with Maj. Gen. Irvin McDowell's III Corps providing cover. The army crossed Bull Run and the last troops across, Maj. Gen. Franz Sigel's I Corps, destroyed Stone Bridge behind them. Gen. Robert E. Lee decided not to press the advantage gained that day, largely because he knew his Army of Northern Virginia was exhausted from two weeks of nearly constant marching and nearly three days of battle, so the Union retreat went unmolested. Lee's decision also allowed the Army of Virginia's II Corps, under Maj. Gen. Nathaniel P. Banks, to consolidate with the bulk of Pope's army, marching in from Bristoe Station, where they had been guarding the army's trains. More importantly, Lee's decision bought time for the Union to push to the front the Army of the Potomac's II, V, and VI Corps, which had been brought from the Peninsula and—much to Maj. Gen. George B. McClellan's dismay—placed under Pope's command.
By the morning of August 31, Pope began to lose his grasp on command of his army. The defeat at Second Bull Run seemed to have shattered his nerve and Pope was unsure what to do next; he knew Washington wanted an attack, but he feared Lee might strike first and destroy his reforming force before it was ready to fight again. Calling a conference of his corps commanders—something he had been loath to do previously in the Virginia Campaign—in his Centreville headquarters, Pope agreed with their decision to retreat further into the Washington defenses. But a message from General-in-Chief Henry W. Halleck directed him to attack and he ordered an advance on Lee's forces on the Manassas field.
Lee, however, had already set in motion his own plan that would rob Pope of the initiative to attack. Lee directed Maj. Gen. Thomas J. "Stonewall" Jackson to march his troops around Pope's right flank to get behind the Union position at Centreville. Leading the way and scouting for any Union blocking force was Confederate cavalry under the command of Maj. Gen. J.E.B. Stuart. Maj. Gen. James Longstreet's command would remain in place for the day to deceive Pope into believing that Lee's entire force remained in his front, while Jackson's command would make its flanking march north and then east to take strategically important Germantown, Virginia, where Pope's only two routes to Washington—the Warrenton Pike (modern U.S. Route 29) and the Little River Turnpike (modern U.S. Route 50)—converged. Jackson's men, hungry and worn, moved slowly and bivouacked for the night at Pleasant Valley, three miles northeast of Centreville. As Pope settled down for the night on August 31, he was unaware that Jackson was on the verge of turning his flank.
The American Civil War (1861–1865) was the deadliest conflict in American history, killing an estimated 620,000 to 750,000 soldiers and an unknown number of civilians. The Confederate States of America, formed by eleven seceding Southern states, faced the Union in four years of warfare across 23 states and territories. Major engagements included First and Second Bull Run, Antietam (the bloodiest single day in American history, September 17, 1862), Chancellorsville, Gettysburg (July 1–3, 1863), Vicksburg (surrendered July 4, 1863), and Sherman's March through Georgia and the Carolinas (1864–1865). President Lincoln issued the Emancipation Proclamation on January 1, 1863, transforming the war's stated purpose to include the abolition of slavery and enabling the enlistment of approximately 180,000 Black men in the United States Colored Troops. Confederate General Robert E. Lee surrendered to Ulysses S. Grant at Appomattox Court House on April 9, 1865. The war resolved the question of secession and ended American slavery, though Reconstruction would face sustained resistance in its attempt to secure civil rights for formerly enslaved people.
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