Battle of Nedao

The Battle of Nedao was a battle fought in Pannonia in 454 CE between the Huns and their former Germanic vassals, the Gepids. Nedao is believed to be a tributary of the Sava River (probably, Nadiža). In this Battle one of Attilas sons Ellac was killed, splitting the Empire between Dengizich and Ernak.

Source
https://en.wikipedia.org/wiki/Battle_of_Nedao