History of the North Sea intense diplomatic crisis. The crisis was defused when Russia was defeated by the Japanese and agreed to pay compensation to the fishermen. During the First World War, Great Britain's Grand Fleet based at Scapa Flow and Germany's Kaiserliche Marine faced each other across the North Sea. Due to its numerical advantage in dreadnoughts, the Grand Fleet obtained Naval superiority and was able to establish a sea blockade of Germany's coast. The goal of the blockade was to deny Germany access to maritime trade including war materials and to guarantee the undisturbed ferrying of British troops. Because of the strong defensive
British submarine flotilla in the Baltic British submarine flotilla in the Baltic A British submarine flotilla operated in the Baltic Sea for three years during the First World War. The squadron of nine submarines was attached to the Russian Baltic Fleet. The main task of the flotilla was to prevent the import of iron ore from Sweden to Imperial Germany. The success of the flotilla also forced the German Navy in the Baltic to keep to their bases and denied the German High Seas Fleet a training ground. The flotilla was based in Reval (Tallinn), and for most of its career commanded by Captain Francis Cromie.