 Complete the following phrase:  Following the November Revolution, the crew of Bogatyr declared for the Bolshevik cause, and the ship joined the Red Navy. After the armistice with Germany in December 1917, Bogatyr was demobilized at Helsinki. 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. Bogatyr sailed to Kronstadt in what became known as the 