On the 9th of January the army landed about four miles below the fort. This was a square bastioned work of three hundred feet on the side, standing on ground elevated above the reach of floods on the left bank, at the head of a horse-shoe bend. It had three casemates, one in the curtain facing the approach up the bend, and one in the face of the northeast and southeast bastions looking in the same direction. In each bastion casemate was a IX-inch, and in that of the curtain an VIII-inch shell-gun. These were the special antagonists of the navy, but besides them there were four rifled and four smooth-bore light pieces on the platform of the fort, and six similar pieces in a line of rifle-pits exterior to and above it. Some trenches had been dug a mile and a half below the fort, but they were untenable in presence of the gunboats, which enfiladed and shelled them out. While the army was moving round to the rear of the fort the admiral sent up the ironclads to try the range, and afterward the light-draught Rattler to clear out the rifle-pits, which was done at 5.30 P.M. Hearing from General McClernand that the troops were ready, the Louisville, Lieutenant-Commander Owen; De Kalb, Lieutenant-Commander Walker, and Cincinnati, Lieutenant Bache, advanced to within four hundred yards of the work and opened fire; the Louisville in the centre, the De Kalb on the right and the Cincinnati on the left, each having one of the enemy's casemate guns assigned to it. The vessels fought bows on, three guns each; the odds being thus three guns afloat to one in casemate on shore, leaving the advantage by the old calculation, four to one, rather with the fort, without counting the light pieces in the latter. When the ironclads were hotly engaged the admiral brought up the light-draught vessels, with the Black Hawk and Lexington, to throw in shrapnel and light rifled shell. Later, when the battery was pretty well silenced, the Rattler, Lieutenant-Commander Watson Smith, was ordered to pass the fort and enfilade it, which he did in handsome style, suffering a good deal from the enemy's fire; when above, however, he became entangled in snags and was obliged to return. No assault was made this day by the army.