Telegram From Secretary Stanton To General H. W. Halleck.

War Department, June 28, 1862.

MAJOR-GENERAL HALLECK:

The enemy have concentrated in such force at Richmond as to render it absolutely necessary, in the opinion of the President, for you immediately to detach 25,000 of your force and forward it by the nearest and quickest route by way of Baltimore and Washington to Richmond. It is believed that the quickest route would be by way of Columbus, Ky., and up the Ohio River. But in detaching your force the President directs that it be done in such a way as to enable you to hold your ground and not interfere with the movement against Chattanooga and East Tennessee. This condition being observed, the forces to be detached and the routes they are to be sent are left to your own judgment.

The direction to send these forces immediately is rendered imperative by a serious reverse suffered by General McClellan before Richmond yesterday, the full extent of which is not yet known.

You will acknowledge the receipt of this despatch, stating the day and hour it is received, and inform me what your action will be, so that we may take measures to aid in river and railroad transportation.

EDWIN M. STANTON, Secretary of War.