On September 1, 1862, Union troops retreated from the area around Chantilly, Virginia, in the aftermath of the Battle of Chantilly, which followed the Second Battle of Bull Run. The fighting occurred during the Northern Virginia Campaign and involved forces under Union General John Pope and Confederate General Stonewall Jackson. Severe weather and confusion on the battlefield contributed to heavy casualties on both sides. The Union withdrawal from Chantilly symbolized another setback for the North at a critical moment in the war. These defeats helped open the way for Robert E. Lee’s first invasion of the North, which culminated at Antietam later that month.
