From Bragg's army.
A letter, of the 18th, from Knoxville, gives us the assurance that Bragg's army has retired to a safe position — while it would be imprudent to state where that position is Gen. Bragg has secured four thousand seven hundred wagons, loaded with provisions, which have been brought away in safely with his army. He lost 2,500 barrels of pork, which was left at Lexington and fell into the hands of the Yankees. Great dissatisfaction was felt among the officers of Bragg's army at the falling back, and many of them literally wept when the order was given. The letter gives us many particulars of the movements of our forces, which it would not be proper to publish. The conclusions to be drawn from all the news in our possession are, that Bragg has met an overwhelming force of the enemy and successfully retreated before it with large stores of provisions, or that he has been too timid, and made forced marches, and fought and wearied his troops for an object which he had not daring enough to accomplish.
