After Gaines's Mill, McClellan left his army with no clear instructions on routes of withdrawal and without naming a second-in-command. The bulk of the V Corps (less McCall), under Brig. Gen. Fitz John Porter, moved to occupy Malvern Hill, while the remaining four corps of the Army of the Potomac were essentially operating independently in their fighting withdrawal. Most elements of the army had been able to cross White Oak Swamp Creek by noon on June 30. About one third of the army had reached the James River, but the remainder was still marching between White Oak Swamp and Glendale. (Glendale was the name of a tiny community at the intersection of the Charles City Road and the Quaker Road, or Willis Church Road, which led over Malvern Hill to the James River.) After inspecting the line of march that morning, McClellan rode south and boarded the ironclad USS "Galena" on the James.