It was Captain Porter's design to assemble his mortar vessels, which had started the day previous from Ship Island, at the outer bar of Mobile Bay. He intended then to cross the bar on their arrival, and to come to anchor inside at given distances, for the bombardment of Forts Morgan and Gaines. Those distances were to be ascertained and minutely determined by the Coast Survey party. Unfortunately a very severe northeast storm had been raging for a day or two, which made all headway for sailing vessels impossible, sweeping most of them far out to sea. The commander directed the Coast Survey party to sound the bar, and to plant buoys at the extreme points of the shoals. Messrs. Oltmanns and Harris, each in a separate boat, were sent to perform this duty, and accomplished it by 10 o'clock A. M. The steamer Clifton accompanied the Coast Survey boats for protection, and was running up and down while the spar buoys were planted on the east and west spit, but, caught by the current, she drifted too close to the east bank inside the bar, and grounded hard and fast, just when the attempt was made to bring her round. The tide at that time was ebbing. All efforts to clear her were unsuccessful, and even the powerful steamer Jackson, which was sent to her relief by the commander, had to give up the attempt and leave her exposed to the fire of Fort Morgan. The enemy opened on her directly after she grounded, and some of the shot and shell from the fort struck within twenty yards of her bows. Captain Porter then suggested her relief by the Sachem, which, on account of her light draft, might approach nearer than the Jackson. After clearing her screw, which had got entangled by some hanging gear, the Sachem got under way, and was anchored alongside and to the southward of the Clifton just before dusk. She let go both her heavy anchors, to prevent any dragging from the great strain that must naturally result from an effort to haul off the grounded steamer. A nine-inch hawser was sent to her, one end of the hawser being made fast to the Sachem. The tide had begun to rise by this time, and fortunately at the first strain on the hawser the Clifton floated, and was quickly drawn alongside of the Sachem. There was no time to spare, as the shell and shot from the fort fell very thick; the Clifton therefore got up steam at once, and moved out of range. The Sachem remained to get up her anchors which had been slipped, and was so engaged until 10 o'clock P. M., when she came to alongside of the Harriet Lane. Captain Porter, as well as Captain Baldwin, expressed great satisfaction with the cheerful readiness and seamanship which were shown by the party on the Sachem.