In 1241, the seemingly unstoppable progress of the Mongol invasion of European gathered further momentum as the combined defending forces of Poles, Czechs and Germans under the command of the Polish duke Henry II the Pious of Silesia (supported by feudal nobility and a few knights from military orders sent by the Pope) were slaughtered at the Battle of the Field of Legnica also called Walstadt.
Mongol march to the Great Sea begins with a famous victory at LiegnitzHeavily armed in both plate and chain, and utilizing weapons such as broadswords, shields, and lances, the Europeans confronted a mobile force carrying daggers, maces, and swords, although their primary weapon was the bow. And the Mongols made maximum advantage of their primary assets of speed and maneuverability by tricking the Duke who was easily lured by a false retreat into an enemy ambush. The Duke himself was struck down and beheaded while attempting to flee the battlefield with three bodyguards, and the Mongols paraded his head on a spear before the town of Legnica. The Mongols cut the right ear off of each fallen European in order to count the dead; they filled nine sackfuls.
The remainder of European nobility faced the same fate. Two Mongol Armies led by Batu and Subutai had invaded Hungary, and a third led by Kadanhad won an unbroken series of victories at Sandomierz, Tursk, Chmielnik and then Krakow. Warned that King Wenceslaus I of Bohemia was two days away with an army of fifty thousand, they had quickly turned from Wroclaw to intercept Henry's forces before the European armies could meet.
The famous victory was another strategic triumph for Subutai and his master plan to destroy the European armies one at a time rather than allowing them to mass in force. Once again, the traditional European warfare method of hand-to-hand combat between knights ended in catastrophe when it was deployed against the Mongol forces, as the Mongols were able to keep a distance and advance with superior number. Subutai and Batu Khan began to plan for the winter invasion of Central Europe, marching all the way to the "Great Sea" (the Atlantic Ocean).
This historical depiction is unaltered other than that the Mongol invasion continues into Central Europe (it has been widely suggested that the invasion would have failed even without the fortuitous death of Ögedei Khan).