For the purpose of this passage Farragut adopted a somewhat novel tactical arrangement, which he again used at Mobile, and which presents particular advantages when there are enemies only on one side to be engaged. Three of his vessels were screw steamers of heavy tonnage and battery; three others comparatively light. He directed, therefore, that each of the former should take one of the latter on the side opposite to the enemy, securing her well aft, in order to have as many guns as possible, on the unengaged side, free for use in case of necessity. In this way the smaller vessels were protected without sacrificing the offensive power of the larger. Not only so; in case of injury to the boilers or engines of one, it was hoped that those of her consort might pull her through. To equalize conditions, to the slowest of the big ships was given the most powerful of the smaller ones. A further advantage was obtained in this fight, as at Mobile, from this arrangement of the vessels in pairs, which will be mentioned at the time of its occurrence. The seventh ship at Port Hudson, the Mississippi, was a very large side-wheel steamer. On account of the inconvenience presented by the guards of her wheel-houses, she was chosen as the odd one to whom no consort was assigned. [Illustration: ORDER OF ATTACK ON BATTERIES AT PORT HUDSON, MARCH 14, 1863. A. Hartford (flag-ship), Captain James S. Palmer. _a._ Albatross, Lieut.-Com. John E. Hart. B. Richmond, Commander James Alden. _b._ Genesee, Commander W. H. Macomb. C. Monongahela, Captain J. P. McKinstry. _c._ Kineo, Lieut.-Com. John Waters. D. Mississippi, Captain Melancton Smith. E. Essex, Commander C. H. B. Caldwell. F. Sachem, Act. Vol. Lieut. Amos Johnson. G. G. Mortar schooners. H. Spot where Mississippi grounded.] Going up the river toward Port Hudson the course is nearly north; then a bend is reached of over ninety degrees, so that after making the turn the course for some distance is west-southwest. The town is on the east side, just below the bend. From it the batteries extended a mile and a half down the river, upon bluffs from eighty to a hundred feet high. Between the two reaches, and opposite to the town, is a low, narrow point, from which a very dangerous shoal makes out. The channel runs close to the east bank.