attack began on 12 October, with the German battleships bombarding Russian coastal batteries on the Sworbe peninsula. Grosser Kurfürst struck a mine but was able to remain in action. The next phase, the clearing of naval forces in the gulf, began four days later as König and Kronprinz led an attempt to break through Russian defenses. In the ensuing Battle of Moon Sound, the German battleships badly damaged Slava and forced her to scuttle, but the rest of the Russian vessels withdrew. By 20 October, the Germans had completed their objectives, including the Army's successful assault on Riga, allowing the fleet to return to the North Sea, though Markgraf was mined on the return voyage. Fate The High Seas Fleet saw little significant activity for the rest of 1917 and into mid-1918, apart from routine training exercises and guard duties in the German Bight. In January 1918, Kronprinz was renamed Kronprinz Wilhelm in honor of Crown Prince William. The ships, less Markgraf, which was dry-docked for maintenance, took part in an abortive attempt to intercept a British convoy to Norway in late April. The ships suffered a series of accidents in 1918, including groundings, that required dry-docking for repairs. Scheer, now the head of the (Naval Warfare Command), and Admiral Franz von Hipper, the fleet commander, planned an operation to seek a final battle with the Grand Fleet in October 1918, by which time the war had turned decisively against Germany. When rumors of the plan began to circulate among the fleet's crews, sailors began to desert in large numbers, leading to the Wilhelmshaven mutiny, which forced Scheer and Hipper to cancel the operation. Following the capitulation of Germany in November 1918, the majority of the High Seas Fleet, under the command of Rear Admiral Ludwig von Reuter, was interned in the British naval base at Scapa Flow. The fleet remained in captivity during the negotiations that ultimately produced the Versailles Treaty. It became apparent to Reuter that the British intended to seize the German ships on 21 June, which was the deadline for Germany to have signed the peace treaty. Unaware that the deadline had been extended to the 23rd, Reuter ordered his ships be sunk. On the morning of 21 June, the British fleet left Scapa Flow to conduct training maneuvers; at 11:20 Reuter transmitted the order to his ships. Of the four ships, Kronprinz was the first