 Complete the following phrase:  In the Prague Offensive, the Fourth Army, together with the Romanian First Army and Polish Second Army, formed part of the Soviet 2nd Ukrainian Front. Marshal Ivan Konev, the commander of the First Ukrainian Front, was the main Soviet commander in the area. Together with Marshal Georgy Zhukovs First Byelorussian Front, Konev launched the great attack on 16 April that resulted in the 