...rmy. As regards the movements of the two brigades of the enemy moving toward Warrenton, the commander of the brigades 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 today, and Longstreet will follow tomorrow. Be w...