USA (US Army of the Potomac, 106,007 men under Burnside) attacked Confederacy (Cs Army of Northern Virginia, 72,497 men under Lee) in Virginia. The CAA Database of Battles records 5 hours of fighting on a front of 7.8 km, a frontal attack against prepared defense, and that Confederacy held. Losses: USA 12,653 (12%), Confederacy 4,656 (6%).
This plan is generated from those figures. It shows the shape of the battle the database describes: the size and width of the armies, the plan of attack and the outcome. It does not show where the units actually stood.