-- The brave, grand soldiers are not comprised in those of one side, any more than the other. Here is a sample of an unknown Southerner, a lad of seventeen. At the War Department, a few days ago, I witness'd a presentation of captured flags to the Secretary. Among others a soldier named Gant, of the One Hundred and Fourth Ohio Volunteers, presented a rebel battle-flag, which one of the officers stated to me was borne to the mouth of our cannon and planted there by a boy but seventeen years of age, who