 On 13 October , the majority of the fleet conducted a sweep into the North Sea , returning to port on 15 October . During 2 – 5 November , Marlborough participated in a fleet training operation west of the Orkneys . Another such cruise took place during 1 – 4 December . The typical routine of gunnery drills and squadron exercises occurred in January 1916 . The fleet departed for a cruise in the North Sea on 26 February ; Jellicoe 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 , Iron Duke 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 . 
 On 13 October , the majority of the fleet conducted a sweep into the North Sea , returning to port on 15 October . During 2 – 5 November , Marlborough participated in a fleet training operation west of the Orkneys . Another such cruise took place during 1 – 4 December . The typical routine of gunnery drills and squadron exercises occurred in January 1916 . The fleet departed for a cruise in the North Sea on 26 February ; Jellicoe <a href='been_done' title='1'><mark>had</mark></a> 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 , Iron Duke and the rest of the fleet sailed from Scapa Flow , to support the Battlecruiser Fleet and other light forces <a href='null_relcl' title='2'><mark>that</mark></a>raided the German zeppelin base at Tondern . 
On 13 October , the majority of the fleet conducted a sweep into the North Sea , returning to port on 15 October . durin 2 – 5 November , Marlborough participated in a fleet training operation west of the Orkneys . anotha such cruise took place ddurin1 – 4 December . The typical routine of gunnery drills and squadron exercises occurred in January 1916 . The fleet departed for a cruise in da North Sea on 26 February ; Jellicoe done intended to use tdaHarwich Force to sweep thdaeligoland Bight , but badd weather prevented operations in thedauthern North Sea . As a result , the daration was confined to the ndahern end of the seda On the night of 25 March , Iron Duke and the resdaf the fleedaailed from Scapa Flow , to support the Battlecruiser Fleet and other light forces raided the Germadaeppelin base at Tondern .