GENERAL ORDERS, NO. 115. WAR DEPARTMENT, Adjutant General’s Office, Washington, March 23, 1864. 1.. By direction of the President of the United States, the number of Army Corps comprising the Army of the Potomac will be reduced to three, viz: the Second, Fifth, and Sixth Corps. The troops of the other two corps, viz: the First and Third, will be temporarily reorganized and distributed among the Second, Fifth, and Sixth by the Commanding General, who will determine what existing organizations will retain their corps badges and other distinctive marks. The Staff Officers of the two corps which are temporarily broken up will be assigned to vacancies in the other eorps, so far as such vacancies may exist. Those for whom there are no vacancies will cease to be considered as officers of the General Staff of Army Corps. IF.Major General G. K. Warren is assigned by the President to the command of the Fifth Army Corps. 111.. The following General Officers are detached from the Army of the Potomac, and will report for orders to the Adjutant General of the Army, viz: Major General George Sykes, U. S. Volunteers. Major General W. H. French, U. S. Volunteers. Major General John Newton, U. S. Volunteers. Brigadier General J. E. Kenly, U. S. Volunteers. Brigadier General F. B. Spinola, U. S. Volunteers. Brigadier General Solomon Meredith, U. S. Volunteers. order of the Secretary of War : E. D. TOWNSEND, Assistant Adjutant Gmeral. Official : Assistant Adjutant General.