Duchy of Bavaria The Battle of the Fischa or Battle of the Leitha took place on 11 September 1146 near the Fischa River at the border of the Kingdom of Hungary and the March of Austria, which then belonged to the overlordship of the Dukes of Bavaria and it was ruled by margraves of the Franconian Babenberg dynasty.

The opponents were a Bavarian army led by duke Henry XI and the Hungarian army under the leadership of king Géza II and his uncle, the palatine Beloš Vukanović, who formerly served as regent and tutor for the underage king.

Before the battle, Géza was girded with a sword, meaning that the young king entered adulthood in the eyes of his people.

Due to this, he didn't know that the Hungarians crossed the Leitha and, seeing a lot of smoke, he thought that they retreated and set their encampments on fire.

Despite this, the Germans heavy cavalry gained the upper hand against the Székely and Pecheneg vanguard, who suffered hefty losses.