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... FORTIFICATION OF THE Mumbus.—The important. work of the defence of the Mumbles, COUITJlanding the- roadstead at Swansea Bay, has been under taken by Go- vernment, and the first steps for the erection of an effi- cient defensive work have just been taken. A battery of heavy guns is to be erected on the Lighthouse Island, inaccessible to an enemy, the water /l? • surroandi& ifc wit)^ a strong ...