The Carolingian reign in East Francia ended in 911 when Arnulf's son, King Louis the Child, died without heirs. The discontinuation of the central authority led to a new strengthening of the German stem duchies. At the same time, East Francia was exposed to the rising threat from Hungarian invasions, especially in the Bavarian March of Austria ("marchia orientalis") beyond the Enns river. In 907 the army of Luitpold, Margrave of Bavaria suffered a crushing defeat at the Battle of Pressburg. Luitpold himself was killed in action and his son Arnulf the Bad assumed the ducal title, becoming the first Duke of Bavaria from the Luitpolding dynasty. However, the Austrian march remained occupied by the Hungarians and the Pannonian lands were irrecoverably lost.