5Osprey's examination of the short yet crucial campaign of the American Civil War (1861-1865). When General Robert E. Lee took command of the Army of Northern Virginia, the Confederacy was in crisis. Lee changed all that in a brilliant, week-long campaign. On 26 June the Confederates struck, fighting two hard-fought battles in two days at Mechanicsville and Gaine's Mill. The ferocity of the Confederate assaults convinced McClellan that he was outnumbered. Unable to keep the Confederates at bay, the Union army was recalled to Washington. Despite losing a quarter of his men, Lee had saved Richmond, and inflicted a humiliating defeat on the Army of the Potomac.