...ederal army occupied the north side of the river, opposite Fredericksburg, extending to the Potomac. Two brigades of Anderson's division, those of Generals Mahone and Posey, were stationed near the United States Mine or Bark Mill Ford; and a third, under command of General Wilcox, guarded Banks's Ford. The cavalry was distributed on both flanks — Fitzhugh Lee's brigade picketing the Rappahannock abov...