...ents of the two brigades of the enemy moving towards Warrenton, the commander of the brigades to be left in the mountains must do what he can to counteract them, but I think the sooner you cross into Maryland after to-morrow the better. The movements of Ewell's Corps are as stated in my former letter. Hill's First Division will reach the Potomac to-day, and Longstreet will follow tomorrow. Be watchf...