Gallienus leads a large Roman force into…

Gallienus leads a large Roman force into Moesia to cut off the army of Goths, three hundred and twenty thousand strong, now retreating by land from its plunder of Aegean coastal cities.

The two armies meet at Naissus (modern Niš, Serbia), where the Romans slaughter the Goths by the thousands.

His attention demanded by the revolt of a usurper, Aureolus, in Italy, Gallienus returns there without further pursuit of the survivors, who flee to armed encampments to the northeast.