The Mongol Invasion of Poland from late 1240 to 1241 culminates in the battle of Legnica, where the Mongols defeat an alliance that includes forces from fragmented Poland and members of various Christian military orders, led by Henry II the Pious, the Duke of Silesia.

The first invasion's intention is to secure the flank of the main Mongolian army attacking the Kingdom of Hungary.

The Mongols neutralize any potential help to King Bela from the Poles and the military orders (including the Teutonic knights in Prussia).