Second Hunnic-Sasanian War

From 404-405 CE the Huns started the Second Hunnic-Sasanian War which resulted in a defeat once again, near Ctesiphon. At the same time the Huns launched a successful invasion into Gothic-controlled eastern Thrace, occupying the city of Mithridatia as well.

Source
https://en.wikipedia.org/wiki/Huns#Before_Attila