GENERAL ORDERS. No. 26. WAR DEPARTMENT, ADJUTANT < J EX El! A I." S OFFICE, Washington, May 27, 1861. All that part of Virginia, east of the Allegheny mountains and north of James river, except Fort Monroe and sixty miles around the same, will, for the present, constitute a new Military Geogra- phical Department, under the command of Brigadier-General Irvin McDowell, [J. S. A., whose Headquarters will bo movable accord- ing to circumstances. By order: L. THOMAS, Adjutant General.