 Complete the following phrase:  From August 1937 to January 1938 Levchenko was Chief of Staff of the Baltic Fleet, and from January 1938 to April 1939 commanded the Baltic Fleet. On 3 April 1939 he was promoted to flagman 1st rank and became Deputy Commissar of the Navy. On 4 June 1940 he was promoted to vice admiral, and went to the Southern Front during the Second World War, where he participated in the 