The traditional European method of warfare of melee 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 numbers. The "New Encyclopædia Britannica", Volume 29 says that "Employed against the Mongol invaders of Europe, knightly warfare failed even more disastrously for the Poles at the Battle Liegnitz and the Hungarians at the Battle of Mohi in 1241. Feudal Europe was saved from sharing the fate of China and Muscovy not by its tactical prowess but by the unexpected death of the Mongols' supreme ruler, Ögedei, and the subsequent eastward retreat of his armies."