 Complete the following phrase:  Benbow was occupied with the typical routine of gunnery drills and squadron exercises in January. The fleet departed for a cruise in the North Sea on 26 February; Admiral John Jellicoe, the commander of the Grand Fleet, had intended to use the Harwich Force to sweep the Heligoland Bight, but bad weather prevented operations in the southern North Sea. As a result, the operation was confined to the northern end of the sea. On the night of 25 March, Benbow and the rest of the fleet sailed from Scapa Flow to support the Battlecruiser Fleet and other light forces that raided the German zeppelin base at Tondern. By the time the Grand Fleet approached the area on 26 March, the British and German forces had already disengaged and a severe gale threatened the light craft. Iron Duke, the fleet flagship, guided the destroyers back to Scapa while Benbow and the rest of the fleet retired independently. On 21 April, the Grand Fleet conducted a demonstration off Horns Reef to distract the Germans while the Russian Navy relaid its defensive minefields in the Baltic Sea. The fleet returned to Scapa Flow on 24 April and refuelled before proceeding south in response to intelligence reports that the Germans were about to launch a 