THE REBELS RETREAT ACROSS THE POTOMAC AND ARE SKEDADLING TOWARDS RICHMOND.
Sigel Supposed to have been Sent to Cut Them Off.
BURNSIDE AT HARPER'S FERRY.
McCLELLAN AND THE MAIN ARMY FOLLOWING UP.
A RAPID RECONNOISSANCE TO THOROUGHFARE GAP.
Terrible Loss of Officers.
GREAT REJOICING AT McCLELLAN'S VICTORIES.
Pennsylvania Troops don't want to Cross the Border.
MUMFORDSVILLE, KY., SURRENDERED TO THE REBELS, WITH 4,000 PRISONERS.
Telegraphed to the Rock Island Argus.
LOUISVILLE, Sept. 19. — At the surrender of Mumfordsville on Wednesday morning the rebels took about 4,000 prisoners, who are reported to have been subsequently paroled, comprising the 6th, 67th, and 89th Ind., 400 men of the 5th Ind., two companies each of the 17th and 74th Ind., 1 company of the 1st Wis., 1 co. of the Louisville provost guard, and 70 recruits for the 33d Ky., the 4th Ohio battery of six guns, with four other guns in position.
The loss at Mumfordsville previously stated was in Sunday's fight.
There were two or three hours of skirmishing on Tuesday between sharpshooters of both sides.
The rebels did not attack us in force in Sunday's fight.
Gen. Chalmers made an attack on our force with 11 regiments on Tuesday night. Buckner's division was added to this force.
The firing on Tuesday was a rebel feint to enable them to secure the south bank of the river. In that we lost two killed and four or five wounded. Eleven of the enemy were killed.