...ordonsville, south of the Rappahannock. When the army of the Potomac reached Warrenton it was placed under command of General Burnside. He marched to Falmouth, hoping to cross the Rappahannock at Fredericksburgh , and to move at once upon Richmond. Delays, resulting from various causes, without fault of the General, permitted the insurgents to occupy the heights of Fredericksburgh, and when, at length, in D...