https://en.wikipedia.org/wiki/Mongol_invasion_of_Europe
From the 1220s into the 1240s, the Mongols conquered the Turkic states of Volga Bulgaria, Cumania, Alania, and the Kievan Rus' federation. Following this, they began their invasion into heartland Europe by launching a two-pronged invasion of then-fragmented Poland, culminating in the Battle of Legnica (9 April 1241), and the Kingdom of Hungary, culminating in the Battle of …