... of Virginia possessed a number of old four-pounder iron guns, which were reamed out to get a good bore, and were rifled with three grooves, after the manner of Parrott. The army in observation at Harper's Ferry , and that at Manassas, were supplied with old batteries of six-pounder guns and twelve-pounder Howitzers. A few Parrott guns purchased by the State of Virginia were with Magruder at Big Bethel. ...