From a small group of 16 men, "Mosby's Command" would grow to include nearly 2000 soldiers. They raided Union supply lines, picket posts and camps ranging from Maryland in the north, to the Rappahannock River, on the south, to the Potomac River on the east, and the western edge of the Shenandoah Valley. "Mosby's Command" was also called the 43rd Virginia Cavalry Battalion.