...djourned to the same place. Lexington, Ky., was entered and occupied by the rebel forces under Gen. E. Kirby Smith. The Union troops evacuated the place a few hours previous, and fell back to Covington .--Natchez, Miss., was shelled by the Union gunboats. Yesterday the rebels commenced an attack upon the National forces at Stevenson, Ala., which continued until to-day, when the rebels retired ...