HEADQUARTERS DEPARTMENT OF THE SUSQUEHANNA,
Harrisburg, Pa., July 30, 1864.

Honorable SIMON CAMERON,

Chairman committee of Public Safety:

SIR: Your note in reference to declaring martial law in the city of Harrisburg is received, &c., and beg to state that after having carefully considered the matter do not believe it is for the interest of the State and country at this present time or moment to comply with your request. I am also of the opinion that it will be productive of more injury than good unless the State looks to Harrisburg to furnish all of the men for her defense.

I am, sir, very respectfully, your obedient servant,

D. N. COUCH,

Major-General, Commanding Department.

POOLESVILLE, MD., July 30, 1864.

(Received 3 p. m.)

Colonel J. H. TAYLOR,

Chief of Staff and Assistant Adjutant-General:

Major Thompson reports that Mosby has crossed the river with 300 men. Major T. has this moment started in pursuit with his command.

H. A. PEARSONS,

Lieutenant, Commanding Detachment.

WASHINGTON, July 31, 1864-11. 30 a. m.

Lieutenant-General GRANT,

City Point, Va.

Will the division of cavalry come armed, mounted, and ready for the field, or must they be mounted and fitted out here?

H. W. HALLECK,

Major-General and Chief of Staff.

FORT MONROE, July 31, 1864-8 p. m.

(Received August 1.)

Major General H. W. HALLECK:

The cavalry going to Washington take all their horses and equipments with them. They will commence reaching you to-morrow. Will it not be well to land them at Alexandria? I have given no order for this.

U. S. GRANT,

Lieutenant-General.

WASHINGTON, July 31, 1864-3 p. m.

Lieutenant-General GRANT,

City Point, Va.:

It appears from General Averell's reports that while General Hunter was collecting his forces at Harper's Ferry to attack the en-