It will be seen from this account, and from the description before given of Mobile Bay, that the advantages of the Tennessee were her great protective strength, a draught which enabled her to choose her own position relatively to the heaviest of the enemy's ships, and the superior range and penetrative power of her guns, being rifles; for while there were cannon of this type in the United States fleet, the great majority of them were smooth bores. The ironclads opposed to her had only smooth-bore guns, incapable of penetrating her side, and therefore only able to reduce her by a continued pounding, which might shake her frame to pieces. The chief defects of the Tennessee as a harbor-defense ship, for which she was mainly intended, were her very inferior speed, and the fact that, by an oversight, her steering chains were left exposed to the enemy's shot. This combination of strong and weak points constituted her tactical qualities, which should have determined the use made of her in the impending battle. Although the ironclads were, as Farragut esteemed them, the controlling factors in the defense and attack, the Tennessee was by no means the only very formidable obstacle in the way of his success. Except the ironclads, the fleet he carried into Mobile Bay was not substantially stronger than that with which he fought his way up the Mississippi; but since that time the enemy had done much to strengthen the works which he now had to encounter. The number of heavy guns in Fort Morgan bearing upon the channel was thirty-eight. In Fort Jackson, excluding the obsolete caliber of twenty-four pounders, there were twenty-seven, and in St. Philip twenty-one--total, forty-eight; but in caliber and efficiency those of Morgan were distinctly superior to those of the river forts, and it may be considered an advantage that the power was here concentrated in a single work under a single hand. The gunners of Fort Morgan, moreover, had not been exposed to the exhausting harassment of a most efficient bombardment, extending over the six days prior to the final demand upon their energies. They came fresh to their work, and suffered during its continuance from no distraction except that caused by the fire of the fleet itself. While, therefore, Fort Gaines could not be considered to support Morgan by any deterrent or injurious influence upon the United States fleet, the latter work was by itself superior in offensive power to the two Mississippi forts.