The launch of HMS Dreadnought in 1906 changed the face of naval warfare. The first half-dozen dreadnoughts were all improvements of the basic Dreadnought design, all carrying ten 12-inch guns. It was only in 1911, with the launch of HMS Neptune that the layout of this powerful armament was altered as a result of practical experience. Two more versions of the Neptune entered service later that same year. These nine improved dreadnoughts formed the core of the British High Seas Fleet.