 On November 7, 1862, Maj. Gen. McClellan was removed from command of the Army of the Potomac and replaced with Maj. Gen. Burnside. Over the course of November, Burnside moved the army south to Falmouth, Virginia, opposite the Rappahannock River from Fredericksburg. The 21st arrived in Falmouth on November 19. Nearly a month passed before Burnside could organize a crossing of the river and an assault on the city and the heights beyond. The Battle of Fredericksburg took place on December 13, 1862.
