SDNDERLAND.—The report of a gun was heard at 7.45 A.M. on the 19th of April, during a light E.N.E. wind, a strong sea, and foggy weather, and the screw steamer, Langdale, of Sunderland, was seen on the North rocks. The No. 1 Life-boat Good Templar was launched, and took off the crew, numbering sixteen men. Much difficulty was experienced in getting the boat alongside the wreck, owing to the rocks and the state of the tide..