...entreville, we then commenced a forced march for Warrenton, in order to save the spoils, and had been in camp not more than an hour, when a courier arrived, stating that the enemy were advancing upon Warrenton . Posting the different squadrons in the most advantageous positions beyond the town, with two pieces, (twelve-pounders,) under command of Lieut. Betts, drawn up on a hill, to the extreme left, a de...