.... Col. Gorgas, Chief of Ordnance, says this is the first intimation he has had as to the disposition of the paroled prisoners. Does he understand that they are to fight before being exchanged? Brig.-Gen. G. J. Rains writes from Charleston that the grenades reported by the enemy to have been so destructive in their repulse at Battery Wagner, were his subterra shells, there being no handgrenades used. The oth...