Lee ordered his Army of Northern Virginia to converge on the retreating Union forces, bottlenecked on the inadequate road network. The Army of the Potomac, lacking overall command coherence, presented a discontinuous, ragged defensive line. Stonewall Jackson was ordered to press the Union rear guard at the White Oak Swamp crossing while the largest part of Lee's army, some 45,000 men, would attack the Army of the Potomac in mid-retreat at Glendale, about southwest, splitting it in two. Huger's division would strike first after a three-mile (5 km) march on the Charles City Road, supported by Longstreet and A.P. Hill, whose divisions were about to the west, in a mass attack. Holmes was ordered to cannonade retreating Federals near Malvern Hill.