Our advices from Maryland are of the highest importance. They show that the rebel army it retreating from that State much more expeditiously than they came into it, and that they are not making their escape unscathed. Gen. Burnside passed through Frederick on Saturday morning, and the whole National army pushed on after the retreating enemy by every available road, and even crossed the fields. The reception of Gen. Burnside in Frederick was a perfect ovation, the people turning out with the wildest enthusiasm ; and when Gen. McClellan entered the place, the streets and sidewalks were perfectly blocked with the enthusiastic masses, including a large proportion of ladies. The firing heard on Friday was an artillery duel between Gen. Pleasanton and the rear guard of the rebels, who were so hard pushed that they were forced to fall back to Middletown, from which place they were also driven in the afternoon. On Saturday our cavalry had two affairs with the enemy, and so pushed them that they were forced to burn half a mile of their wagon trains. This, in addition to a train of a hundred ammunition and subsistence wagons, captured by Gen. Franklin, will prove quite a serious loss tor the rebels. Our troops were in fine spirits, and much elated at the cordial reception extended to them by the people of Maryland. All danger of an invasion of Pennsylvania may now be considered past, as the rebels will no doubt have enough to do to escape the death they have courted. Gov. Curtin, however, does not relax his preparations, but is determined to put the State upon a thorough war footing.
Generals Hooker and Reno, on Sunday, carried the height commanding tho Hagerstown road, near Middletown, Md. Gen. Franklin commanded on the extreme left in the battle. Gen. Reno was killed. The enemy made for the river in a perfect panic. Gen. Lee was wounded, and Gen. Garland killed. Gen. Hooker took over one thousand prisoners ; besides seven hundred were sent to Frederick. It is stated that Gen. Lee gives his loss at 15,000. Our men pursued the rebels as rapidly as they could.
Scouts who left Hagerstown at 3 o’clock Sunday afternoon, say that Longstreet’s division (except Toombs’ brigade) had left Hagerstown.
The entire army left Frederick at daylight on Sunday morning, taking the Harper’s Ferry road, in the hope of coming with Jackson and Hill before they crossed the Potomac.
Fifty wagons and fifty prisoners have been taken on the road between Hagerstown and Williamsport, Md., and brought into Chambersburg.
Smyrna Times, Smyrna, DE