Issued by the U.S. War Department on June 6, 1861, General Orders No. 30 extended the Department of the Ohio to include the State of Missouri.
GENERAL ORDERS NO. 30
War Dep’t, Adjutant General’s Office
Washington, June 6, 1861
-The State of Missouri is added to the Military Department of Ohio, Indiana, Illinois, and portions of Western Pennsylvania and Virginia. Major General McClellan will extend his command accordingly.
L. THOMAS, Adjutant General