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The Latest News.

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Battle on the Upper Potomac.
HEAVY FIRING IN THE DIRECTION OF HARPERS' FERRY.
EXCITEMENT IN PENNSYLVANIA.
Great Rush of Armed Citizens to Harrisburg.
Gen. Hooker's Division Occupies Frederick, Md.
LONGSTREET AT HAGARSTOWN.
From Frederick, Md.

WASHINGTON, Sept. 14.

The following was received by the Associated Press by special messenger:

FREDERICK, Sept. 13.

Frederick is ours. Our forces entered the east end of the town yesterday afternoon. — One hour later the cavalry force, under Pleasanton, entered by Market street turnpike.

The main body of the rebels evacuated the city on Thursday.

A few companies of Stewart's cavalry and Hampton's Legion made a charge upon our troops, but the enemy was speedily repulsed. Our loss was two killed and six wounded. They suffered to that extent at least.

The reception of our forces was most enthusiastic by the entire city. The people turned out en masse.

The rebel force is represented to be 125,000 strong.

The citizens of Frederick suffered much from the rebel incursion, including the loss of domestic supplies.

The rebels left Frederick with the intention of invading Pennsylvania. Subsequent events indicate they endeavored to retreat into Virginia via Williamsport.

Four hundred and fifty rebel sick, left at Frederick, were paroled.

Yesterday afternoon the 8th Illinois cavalry charged on two rebel regiments and three guns, a short distance aboave Middletown, on the road leading to Hagerstown. We had three men wounded and took forty prisoners.

Later in the afternoon four squadrons of the 3d Indiana cavalry charged on a regiment of rebel cavalry, supported by artillery, on the road leading from Middletown to Harper's Ferry. It was a desperate affair.

We lost thirty killed and wounded. Our cavalry so pushed the enemy's wagon trains yesterday, they were forced to burn half a mile of wagons to prevent their falling into our hands.

A man who left Harper's Ferry yesterday evening states that Longstreet was repulsed in the morning at 8 A.M. The battle was renewed in the direction of Harper's Ferry. — Firing rapid and heavy. Our main forces, it is thought, will come up to the enemy this evening.