...Dowell from Bull run to Washington, Longstreet's brigade, with artillery and Stuart's cavalry, was advanced, first to Centreville, then to Fairfax, and later to Falls Church and Mason's, Munson's and Upton 's hills, commanding positions in full view of Washington, but with orders, writes Longstreet, not to attempt to advance even to Alexandria. The Federal authorities soon threw a cordon of well-locat...