the army corps hitherto command by Major-General McDowell. It is important that this be communicated to General Hooker at once, as General McDowell's corps us under orders to march, and is now perhaps in motion.

S. WILLIAMS,

Assistant Adjutant-General.

WASHINGTON, September 6, 1862 - 2 a.m.

Brigadier General R. B. MARCY, Chief of Staff:

Your dispatch of 11.30 p. m. of yesterday just received, and orders issued for General Cox's pickets to be relieved. My headquarters are at Arlington.

IRVIN McDOWELL,

Major-General, Commanding.

WASHINGTON, September 6, 1862 - 4.05 p.m.

(Received 5.30 p. m.)

Major-General McDOWELL,

Or Senior Officer Commanding First Army Corps, Upton's Hill:

General McClellan directs that you move your corps at once to this side of the river, by the Long and Aqueduct Bridges, taking the Seventh street road to Leesborough, or its vicinity. It is important that this movement be made promptly.

A. V. COLBURN,

Assistant Adjutant-General.

HEADQUARTERS THIRD CORPS,
Near Arlington House, September 6, 1862 - 5.30 p.m.

Colonel COLBURN,

Assistant Adjutant-General, Washington:

I have received your telegram, directed to Upton's Hill, ordering the movement of Third Corps to Leesborough. As I am informed at the War Department that I am relieved from the command of this corps, I have turned over the order to the second in command-General Ricketts.

IRVIN McDOWELL,

Major-General.

SEPTEMBER 6, 1862 - 7.50 p. m.

Brigadier General S. WILLIAMS,

Assistant Adjutant-General, Washington:

Shall the divisions of the Third Corps, ordered to move to Leesborough, quit the forts at Upto's Hill before they are dismantled and the ammunition removed? Will you please give the order direct, as I move my headquarters to Washington?

IRVIN McDOWELL,

Major-General.