 Complete the following phrase:  During the October Revolution of 1917, the crew of Oleg quickly declared support for the Bolshevik cause. The Treaty of Brest-Litovsk required the Soviets to evacuate their base at Helsinki in March 1918 or have their ships interned by newly independent Finland even though the Gulf of Finland was still frozen over. Oleg sailed to Kronstadt in what became known as the 