...command in the vicinity of Manassas, intrench yourself strongly and throw cavalry pickets out to the front. Your first care will be the rebuilding of the railway from Washington to Manassas, and to Strasburg , in order to open your communications to the Valley of the Shenandoah. As soon as the Manassas Gap Railway is in running order, intrench a brigade of infantry, say four regiments, with two batterie...