The War News.Nothing occurred on the lines in front, of Petersburg, yesterday, worthy of mention, except some picket skirmishing, which was probably brought about by way of varying the monotony prevailing for some days past. Persons who visited Port Walthall Junction inform us that dense clouds of dust could be seen in the direction of the enemy's lines, supposed to have been caused by wagon trains moving towards City Point. It is further reported, that heavy columns of smoke were observed yesterday in the same direction, and, indeed, this was distinctly seen last evening about sundown from the Petersburg depot, in this city. The inference is, that the Yankees are burning their surplus material, preparatory to another change of base — this time, probably, to the Potomac. A scout reports that there are sufficient evidences of a considerable diminution of the Federal force in front of Petersburg, and we would not be much surprised if the whole army, at no distant day, pulled up stakes and left, bag and baggage, for another scene of operations. This seems hardly possible, after their immense preparations and vain-boastings of what they were going to accomplish on that line; but the disaster of July 30th threw a damper upon the spirits of the Yankees, and filled them with dismal forebodings as to the future. Besides, they have some apprehensions for the safety of their own capital, which may cause them to abandon present efforts for the reduction of Petersburg and Richmond. The enemy burnt the village of Prince George Court-House on the 7th instant. One account says it was accidentally fired by some troops quartered there, but the probability is, that it was done through mere wantonness, and for the gratification of a malignant spite on the part of the Yankees. The Court-House is situated near the centre of Prince George county.
The Northern Border.We have no later news concerning the movements of our forces in the Valley of Virginia. The Northern papers of the 10th seem perfectly ignorant of their whereabouts, and content themselves with a mendacious statement of the affair at Moorefield on Sunday last. Our troops seem to have inflicted considerable damage upon property in the enemy's country on their last visit besides the burning of Chambersburg. The President of the Chesapeake and Ohio canal reports that the damage to that work will keep back over a hundred thousand tons of coal from the Washington market this season. Workmen were employed upon the badly-damaged section of the canal at Antietam, but the rebel forces in the vicinity drove them away.
Promoted.We learn that Major-General Maury has been promoted to the rank of Lieutenant-General, and takes charge of the Military Department of the Gulf, (which includes Mobile,) in the place of Lieutenant-General Lee, who has been ordered to the field. It is stated that General Higgins takes the place recently occupied by General Maury.
Tupelo, is in the saddle again, and preparing to meet the enemy advancing from Memphis by way of Holly Springs. General Forrest is in full command for this fight, and the country will expect him to conduct it to a successful result.