On August 11, 1862, the US War Department issued General Orders, No. 101, announcing President Abraham Lincoln's appointment of Major General Henry Halleck as General-in-Chief of US land forces, effective July 11, 1862.
GENERAL ORDERS, No. 101.
WAR DEPARTMENT, ADJT. General ‘S OFFICE,
Washington, August 11, 1862.
The following order is published to the Army:
Washington, July 11, 1862.
Ordered, That Major General Henry W. Halleck, be assigned to command the whole land forces of the United States as General-in-Chief, and that he repair to this capital as soon as he can with safety to the positions and operations within the department now under his special charge.
Major-General Halleck, having been assigned, in accordance with the above order of the President, assumed command of the Army as General-in-Chief on the 23rd of July, 1862.
By command of Major-General Halleck:
E. D. TOWNSEND,