September 03, 1862
Ordered, That the general-in-chief, Major-General Halleck, immediately commence, and proceed with all possible despatch; to organize an army, for active operations, from all the material within and coming within his control, independent of the forces he may deem necessary for the defense of Washington when such active army shall take the field.
By order of the President:
EDWIN M. STANTON, Secretary of War.
[Indorsement.]
Copy delivered to Major-General Halleck, September 3, 1862, at 10 p.m.
E. D. TOWNSEND, Assistant-Adjutant General.
Abraham Lincoln, Order to General H.W. Halleck Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/201961