NORTH DEAL—The coxswain of the Life-boat Mary Somerville was called, at about 1.30 A.M. on the 12th December, by the Coastguard, who informed him that guns and rockets were being fired by the Gull light-vessel. He at once summoned the crew, and, the Life-boat being promptly launched, proceeded to the lightship, and was informed that & vessel was in need of assistance, bearing about E.N.E. The boat steered in that direction, and, after cruising about the sand for a short time, found the barque Mandalay, of Glasgow, bound from. Middlesbrough, for the River Plate with railway chairs and sleepers, and having a crew of sixteen men on board, stranded on the off part of the North Sand Head. The Life-boat men laid out a kedge anchor, and assisted in throwing cargo overboard, BO as to lighten the barque, which was got afloat at about 3 o'clock on the following morning.