on a British convoy to Norway. On 27 November the ship traversed the Kaiser Wilhelm Canal into the Baltic, but did not participate in the occupation of the islands in the Gulf of Riga. A third and final fleet advance took place in April 1918, but was cut short when the battlecruiser Moltke developed engine problems and had to be towed back to port. Helgoland and her three sisters were to have taken part in a final fleet action days before the Armistice was to take effect. The bulk of the High Seas Fleet was to have sortied from their base in Wilhelmshaven to engage the British Grand Fleet; Scheer—by now the Grand Admiral (Großadmiral) of the fleet—intended to inflict as much damage as possible on the British navy, in order to retain a better bargaining position for Germany, despite the expected casualties. However, many of the war-weary sailors felt the operation would disrupt the peace process and prolong the war. On the morning of 29 October 1918, the order was given to sail from Wilhelmshaven the following day. Starting on the night of 29 October, sailors on Thüringen and then on several other battleships mutinied. Early on the 30th, the crew of Helgoland, which was directly behind Thüringen in the harbor, joined in the mutiny. The I Squadron commander sent boats to Helgoland and Thüringen to take off the ships' officers, who were allowed to leave unharmed. He then informed the rebellious crews that if they failed to stand down, both ships would be torpedoed. After two torpedo boats arrived on the scene, both ships surrendered; their crews were taken ashore and incarcerated. The rebellion then spread ashore; on 3 November, an estimated 20,000 sailors, dock workers, and civilians fought a battle in Kiel in an attempt to secure the release of the jailed mutineers. By 5 November, the red flag of the Socialists flew above every capital ship in Wilhelmshaven save . The following day, a sailors' council took control of the base, and a train carrying the mutineers from Helgoland and Thüringen was stopped in Cuxhaven, where the men escaped. According to the terms of the Treaty of Versailles, all four Helgoland-class battleships were disarmed and surrendered as prizes of war to the Allies as replacements for the ships scuttled in Scapa Flow. On 21–22 November 1918, Helgoland steamed to Harwich to retrieve the crews of U-boats