We have received from the agent of the Press Association the following brief summary of news from the Washington Chronicle of the 6th--all that he had an opportunity to copy:
From the upper Potomac.
Pittsburg, August 5.
--A dispatch has been received here, stating that an engagement was fought yesterday at 4 P. M. with the raiders at New Creek, on the Baltimore and Ohio railroad, twelve miles east of Piedmont, towards Cumberland.
The fight was desperate.
Pittsburg, August 5.--General Kelly telegraphs officially to this city: "My forces repulsed the enemy yesterday at New Creek, under McCausland and Bradley Johnson.
The enemy attacked our post to-day at three o'clock P. M. The fight continued until late in the evening.
The enemy then retired, leaving their killed and wounded.
Their loss was severe.
Ours light — not exceeding twenty-five killed and fifty wounded. The garrison made a gallant resistance."
Governor Curtin has called for thirty thousand militia.
In his proclamation, he says: ‘
"I cannot too earnestly urge upon the people of this State the necessity for the immediate presence of this force." ’
General Couch has issued an appeal to the people of Pennsylvania.
He urges them to prepare themselves for defence, to put their guns in order, get in the cover of their corn-fields, forests, buildings, &c., as a rebel raid is not impossible at any time during the summer.
Harrisburg, August 5.--Five messengers from General Averill have reached McConnellsville, and repeat that the rebels, three thousand strong, were crossing the Potomac at Hancock.
They further state that our pickets were being driven in towards Cumberland.
