DECEMBER 17th.—Averill (Federal) made a raid a day or two since to Salem (Roanoke County, Va.), cutting the Virginia and Tennessee Railroad, destroying the depot, bridges, court-house, etc.
Gen. J. E. Johnston has been ordered to take command of Bragg’s army.
I saw a communication from Lieut.-Col. Ruffin (Commissary Bureau), suggesting the trade of cotton to the enemy in New Orleans for supplies, meat, etc., a Mr. Pollard, of St. Louis, having proposed to barter meat for cotton, which Col. Ruffin seems to discourage.
Gen. Halleck has proposed a plan of exchange of prisoners, so far as those we hold go. We have 15,000; they, 40,000.
A letter from Mr. Underwood, of Rome, Ga., says our people fly from our own cavalry, as they devastate the country as much as the enemy.
We have a cold rain to-day. The bill prohibiting the employment of substitutes has passed both Houses of Congress. When the Conscription act is enlarged, all substitutes now in the army will have to serve for themselves, and their employers will also be liable.