 Complete the following phrase:  All four of the Ganguts were assigned to the First Battleship Brigade of the Baltic Fleet in December 1914  January 1915 when they reached Helsingfors. Their turrets and fire-control systems, however, were still being adjusted and fine-tuned through the next spring. Their role was to defend the mouth of the Gulf of Finland against the Germans, who never tried to enter, so they spent their time training with occasional sorties into the Baltic. Several ships ran aground in 1915 and 1916, often while providing cover for minelaying operations, but only Sevastopol suffered any significant damage. A minor mutiny broke out on 1 November on board Gangut when the executive officer refused to feed the crew the traditional meal of meat and macaroni after coaling. The crews of the battleships joined the general mutiny of the Baltic Fleet on 16 March 1917, after the idle sailors received word of the February Revolution in Saint Petersburg. The Treaty of Brest-Litovsk required the Soviets to evacuate their base at Helsinki in March 1918 or have them interned by newly independent Finland even though the Gulf of Finland was still frozen over. Gangut and her sisters led the first group of ships on 12 March and reached Kronstadt five days later in what became known as the 