General (Stonewall) Jackson in retreat before the army under General Fremont fell upon an advance body of the force under General Shields, near Port Republic, Va. After a hard fight this advance body fell back upon the main body under General Shields, and Jackson continued his retreat.--(Doc. 19.)
The Senate of the United States resolved itself into a High Court of Impeachment, for the trial of Judge Humphreys, of Tennessee, for treason, and the members of the House of Representatives were introduced in due form; but it was finally concluded to postpone the proceedings until the twenty-sixth.--The House bill prohibiting slavery in the territories was passed.--Secretary Welles addressed an elaborate communication to the Naval Committee of Congress on the construction of armored ships.
General Halleck at Corinth, Miss., sent the following despatch to the War Department:
The enemy has fallen back fifty miles from here by railroad, and near seventy miles by wagon road. General Pope estimates the rebel loss from casualties, prisoners, and desertion, at over twenty thousand, and General Buell at between twenty thousand and thirty thousand. A person who was employed in the confederate commissary department, says they had one hundred and twenty thousand men in Corinth, and that now they cannot muster much over eighty thousand. Some of the fresh graves on the road have been opened and found filled with arms. Many of the prisoners beg not to be exchanged, saying they purposely allowed themselves to be taken. Beaureguard himself retreated from Baldwin on Saturday afternoon to Okolona, Miss.
Brigadier-General D. B. Birney, having  been tried by court-martial, and honorably acquitted of the charges brought against him, this day reassumed command of his brigade by order of General Kearny, commmanding division.
The House of Representatives of the United States called for information respecting the organization by General Hunter, of the Department of South-Carolina, of a regiment of black volunteers for the defence of the Union.--(Doc. 132.)
An interesting correspondence between Judge Rost, Captain Huse, and R. M. T. Hunter, rebel agents in Europe, was this day published.