...en prowling about the enemy's encampments in different parts of the country, and had discovered the following facts: One of the enemy's army corps, under Sigel, was on their right among the hills at Sperryville , watching the roads and all direct communication with their rear at Mount Washington, Warrenton, and Manassas Junction; a heavy force was stationed on Pope's left, at or near Waterloo on the Rappahan...