WITHERNSEA, YORKSHIRE.—Information was received, at 6 A.M. on the 14th August, that the smack Excel, of Grimsby, was on shore off Waxholme Mill. The Admiral Rom Life-boat was launched, but was driven back by the heavy surf. After considerable difficulty, the crew and launchers having to go up to their waists in the water to push the boat out, she was at last got off, and succeeded in rescuing four men. One of the crew, against the advice of his shipmates, had tried to get ashore in the smack's boat; but it was filled by the heavy sea, and the man with very great difficulty reached the shore by swimming..