Heinrich gathered the northern princes, together with the Teutonic
knights, to meet the Mongols in battle at Liegnitz, 9 April 1241.
Totally defeated, and his horse having dropped from exhaustion in the
flight, Heinrich tried to escape running on foot hampered by his heavy
armour, but the Mongol horsemen soon caught up with him and rode off
in triumph with his severed head on a spear. His widow, Anne of
Bohemia, only identified his headless, mangled, naked corpse because
Heinrich had six toes on his left foot. Meanwhile, the victorious
Mongols filled nine large sacks with a single ear from each of their
slain opponents.
 

Source: Leo van de Pas