King Bela IV makes a stand against the Austrian invasion: supported by the liensmen of his son-in-law, Prince Rostislav Mikhailovich, he gathers his troops and marches against Frederick's forces, which are challenged at the Battle of the Leitha River, in which the Babenberg ducal male line becomes extinct at the death of Frederick.

The battle sparks another conflict for the rule over the ceased Imperial fiefs of Austria and Styria.