The fleet departed for a cruise in the North Sea on 26 February 1916; Jellicoe had intended to use the Harwich Force to sweep the Heligoland Bight but bad weather prevented operations in the southern North Sea and the operation was confined to the northern end. Another sweep began on 6 March but was abandoned the following day as the weather grew too severe for the destroyer escorts. On the night of 25 March, "Erin" and the rest of the fleet sailed from Scapa Flow to support Beatty's battlecruisers and other light forces raiding 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 strong gale threatened the light craft, so the fleet was ordered to return to base. On 21 April, the Grand Fleet conducted a demonstration off Horns Reef to distract the Germans while the Russian Navy re-laid its defensive minefields in the Baltic Sea. The fleet returned to Scapa Flow on 24 April and refuelled before sailing south, over intelligence reports that the Germans were about to launch a raid on Lowestoft. The Germans had withdrawn before the fleet arrived. On 2–4 May, the Grand Fleet conducted another demonstration off Horns Reef to keep German attention on the North Sea.