General Burnside retreating on the advance of Longstreet, evacuated Lenoir, Tenn., but fought a battle at Campbell's Station. The fight lasted for some hours. The Federal troops retreated to the protection of their batteries, which opened upon the rebels with effect, and checked their advance. They fell back to the river; a second battle was fought in the afternoon, which continued until nightfall, Burnside remaining in possession of the ground. Loss of the rebels estimated at one thousand killed and wounded. Lieutenant-Colonel Smith, Twentieth Michigan, was killed.--Doc. 19.