On November 7, 1862, Major General Ambrose Everett Burnside received orders to do something he had previously twice declined to do. No longer allowed such soldierly discretion, the President now ordered him to assume command of the Union Army of the Potomac. His friend and former commander, and perhaps the most popular commanding general the Army of the Potomac would ever have, Major General George B. McClellan would be sent home to New Jersey to "await further orders" that would never come. General Burnside, aware of Lincoln's criticism of his predecessors' perceived slowness to action, would quickly devise a plan to outmaneuver the Southern Army by crossing the Rappahannock at Fredericksburg. The Union commander would place emphasis on the speed of the Army of the Potomac and the building of the crucial pontoon bridges across the Rappahannock River. Out marching General Lee would allow the bluecoats to have the inside track towards Richmond. General Lee, in Burnside's mind, would have no choice but to leave his fortifications and face a much larger army in the open.

Although Burnside's men began arriving along the banks of the Rappahannock on November 17, General Lee and his men would arrive to defend the Fredericksburg side of the river a week before the pontoons. This delay would allow the southerners to establish and fortify their defensive lines making the Union's chances to maneuver appear exceedingly grim.

The above image pictures a section of a pontoon bridge recreated on the grounds of Chatham Manor, Major General Edwin Vose Sumner's headquarters during the battle. The reconstructed pontoon is 80% of what would have been the actual size during the battle. [11]