The Richmond, with the Genesee alongside, following the Hartford, had reached the last battery and was about to make the turn when a plunging shot entering about four feet above the berth-deck, passed through a barricade of clothes-bags and hawsers into the engine-room, upsetting the starboard safety-valve; then glancing a little upward, it displaced the port safety-valve weight and twisted the lever, leaving the valve partly opened. The steam escaped so rapidly as to reduce the pressure at once to nine pounds, while filling the fire-room and berth-deck. Deprived thus of her motive force, it was found that the Genesee was not able to drag both vessels up against the strong current then running. Commander Alden was therefore compelled to turn down stream, and after some narrow escapes from the fire of his own fleet, was soon carried by the gunboat out of range. The two vessels lost 3 killed and 15 wounded; among the latter the first lieutenant of the Richmond, A. Boyd Cummings, mortally. The Monongahela and Kineo were third in line. While under the fire of the principal batteries, musketry opened upon them from the west bank, which was soon silenced by shrapnel and grape from the Kineo. A few moments later a chance shot lodged between the stern-post and rudder-post of the gunboat, wedging the rudder and making it completely useless. The density of the smoke, complained of by all the officers of the fleet that night, caused the pilots to miss their way; and the larger ship took the ground on the spit opposite the town. The Kineo, not touching, with the way she had tore clear of her fasts, and, ranging a short distance ahead, grounded also. Both vessels received considerable though not serious damage from the violence of the separation. The Kineo was soon able to back clear and, though disabled, managed to get a hawser from the Monongahela and pull that ship off after she had been twenty-five minutes aground. The latter then went ahead again, while the Kineo, unable to steer properly, drifted down stream out of range. While aground a shot came in, cutting away the bridge under Captain McKinstry's feet, and throwing him to the deck below; the fall incapacitated him from remaining at his station, and Lieutenant-Commander N.W. Thomas took command of the Monongahela. Meanwhile the Mississippi had passed, unseen and unseeing, in the smoke, and had herself grounded a little farther up near the head of the spit. She was observed to be on fire as the Monongahela again drew near the bend, and at the same moment the latter vessel's engines ceased to move, a crank-pin being heated. Thus unmanageable she drifted down within thirty yards of the batteries, and had to anchor below. Her loss was 6 killed and 21 wounded; the Kineo, though repeatedly struck, had no one hurt.