General Stoneman has issued an order relative to the Ku-Klux of Virginia, instructing Colonel Rose to notify the civil officers of his district that if they do not arrest the authors of the outrages reported, and not prevent the occurrence of such outrages in future, he will send a detachment of mounted men into that region, to be subsisted and foraged at the expense of the citizens, until good order is re-established and security to person and property is again afforded by the civil authorities.