...the enemy's rear-guard, near Downsville, Md., when our spies discovered that lines of rifle-pits were ready to contest their advance. These works were erected on the brow of quite a large hill, and General Kilpatrick at once resolved to feel the strength of his foe. Two companies of the Sixth Michigan cavalry, B and F, were ordered to charge up the hill to the earthworks, which was done in fine style. As our me...