Bosporan War under Diocletian?

[Nathan Ross]

Did Tacitus win a victory over the Alans near the Maeotis swamp? The Historia Augusta says he defeated the Scythians

HA Tacitus says: "with wisdom and courage he crushed the barbarians — for they had broken forth in great numbers from the district of Lake Maeotis", and calls these barbarians  'Maeotidae' - the note for this in Loeb (here on Lacus Curtius) calls them 'Eruli', but notes that Zosimus calls these people 'Scythians', and Tacitus commemorated it as a 'Gothic' victory.

So - anybody's guess. But the fighting doesn't seem to have involved an expedition to the Azov!