When Admiral Fisher returned to the post of First Sea Lord in 1915, the leadership of the British Navy was faced with the issue of landing troops on the German Baltic coast. It was planned that Russian troops would cover the operation, and this required ships with the largest guns possible. Light battlecruisers Courageous, Furious, and Glorious were built within this concept, while Incomparable, armed with the worlds largest 508 mm guns, was to represent its further development.