 Complete the following phrase:  The Mongol invasion of Europe in the 13th century occurred from the 1220s into the 1240s. In Eastern Europe, the Mongols conquered Volga Bulgaria, Cumania, Alania, and the Kievan Rus federation. In Central Europe, the Mongol armies launched a two-pronged invasion of fragmented Poland, culminating in the Battle of Legnica 9 April 1241, and the Kingdom of Hungary, culminating in the 