Doc. 121.-General McClellan's command.The following general order defines the extent of General McClellan's new command:
war Department, Adjutant-General's office, Washington, July 25, 1861.First--There will be added to the Department of the Shenandoah the counties of Washington, Alleghany, in Maryland, and such other parts of Virginia as may be covered by the army in its operations. And there will be added to the Department of Washington the counties of Prince George, Montgomery, and Frederick. The remainder of Maryland, and all of Pennsylvania and Delaware, will constitute the Department of Pennsylvania, Headquarters Baltimore. The Department of Washington and the Department of Northeastern Virginia will constitute a geographical division under Major-General McClellan, United States Army, Headquarters Washington. Second--All officers of volunteer regiments will be subject to examination by a Military Board, to be appointed by this department with the concurrence of the General-in-Chief, as to their fitness for the positions assigned them. Those officers found to be incompetent will be rejected, and the vacancies thus occasioned will be filled by the appointment of such persons as may have passed the examination before the Board. Third--Camp Pickett, San Juan Island, W. T., and Fort Chekalis, Gray's Harbor, W. T., are announced as double ration posts, the former from July 22d, 1859, and the latter from------11th, 1860, being the respective dates of their first occupation by troops. Fourth--Captain Robert Garland, and First Lieutenant Edward J. Brooks, Seventh Infantry, having given evidence of disloyalty, are dropped from the rolls of the army, to date from May 23d, 1861, and May 16th, 1861, respectively. First Lieutenant James Leshler, Tenth Infantry, having overstayed his leave of absence, and failed to report to the Commanding Officer of the Department of the West, is dropped from the rolls of the army, to date from July 15th, 1861. By order,L. Thomas, Adj't-General.