Progress of the war in Maryland.
REBELS EXCUSE THEIR DEFEAT BY SAYING THEY EXPECTED BEAUREGARD WITH 40,000 MEN.
FEDERAL CAVALRY ESCAPE FROM THEIR PERILOUS POSITION AT HARPER'S FERRY.
McCLELLAN PURSUES THE REBELS AT THE HEAD OF HIS CAVALRY AND ROUTS THEM WITH GREAT SLAUGHTER.
THE REBELS FLYING BEFORE HIM.
HOW THEY FEEL IN RICHMOND.
Telegraphed to the Rock Island Argus.
WASHINGTON, Sept. 15. — The Star says at 9 a.m. to-day, the engagement at Burnside's position had not been renewed. He was then in undisputed possession of the advantageous crest of the mountain, from which he drove the enemy the night before.
The firing that commenced at daybreak today, was an attack of the enemy on Franklin's corps, on the road to Harper's Ferry.
No direct communication was had with that corps at 9 o'clock this morning.
The telegraph operator at Point of Rocks reports that Franklin was heavily engaged this morning some miles in front of him.
The division or army corps that yesterday morning occupied Hagerstown was not in yesterday's action, though it hastily retraced its steps in order to be in the fight today; nor Sumner's army corps, nor Couch's division, were in the action of yesterday, though both are doubtless supporting Franklin to-day, as they were in position to do so yesterday evening.
The army corps of Porter passed through Frederick to-day at 8 a.m., and were to have arrived on the battlefield at noon.
The rebels in the fight say Beauregard is expected to join them to-day with an army corps of 40,000 men.
We have no idea that any such expectation of theirs can be realized.
Burnside's position, from the enemy in yesterday's battle commands the road from Hagerstown to the position where Franklin is fighting, we believe to-day. Hence its great importance. To lose it will be most damaging to the enemy.