...dered forward simultaneously with the advance of Grant on the Rapidan. Crook was to break the Virginia and Tennessee Railroad, and destroy the lead mines and salt works in Southwest Virginia, while Sigel was to move up the Shenandoah Valley, and threaten Staunton and Charlottesville. Crook sent his cavalry under Averell against Wytheville and Saltville, while he led his infantry towards Dublin and ...