Frank Moore, ed. Vol. 5. New York: G. P. Putnam, 1863.
The Fifth and Sixth regulars, with Capt. Robertson's battery of horse-artillery, went out from Bolivar Heights, Md., on a reconnaissance, under command of Major Whiting of the Second cavalry. At Halltown, five miles off, they encountered the rebel pickets, and drove them in. Approaching within a mile and a half of Charlestown, they met the rebels in force, with infantry, cavalry, and one battery. There was considerable picket-firing, but no casualties on the National side. The expedition, ascertaining that the enemy occupied Charlestown in force, returned, bringing five or six prisoners. Several of them rode horses branded "U.S.," which they said were captured at the first Bull Run battle.
Timeline of West Virginia: Civil War and Statehood: September 1862