_Washington, March 11, 1862_.
Major-General McClellan having personally taken the field at the head of
the Army of the Potomac, until otherwise ordered he is relieved from the
command of the other military departments, he retaining command of the
Department of the Potomac.
_Ordered further_, That the departments now under the respective
commands of Generals Halleck and Hunter, together with so much of that
under General Buell as lies west of a north and south line indefinitely
drawn through Knoxville, Tenn., be consolidated and designated the
Department of the Mississippi, and that until otherwise ordered
Major-General Halleck have command of said department.
_Ordered also_, That the country west of the Department of the Potomac
and east of the Department of the Mississippi be a military department,
to be called the Mountain Department, and that the same be commanded by
Major-General Frémont.
That all the commanders of departments, after the receipt of this order
by them, respectively report severally and directly to the Secretary of
War, and that prompt, full, and frequent reports will be expected of all
and each of them.