Their naval forces ravaged Byzantium and Chrysopolis , though the imperial fleet successfully counter-attacked on the Propontis .
In 268 , the Goths launched a combined land - sea invasion against the Roman Empire , assisted by Heruli sailors and other tribesmen .
Goths ' naval forces ravaged Byzantium and Chrysopolis , though the imperial fleet successfully counter-attacked on the Propontis .
In 268 , the Goths launched a combined land - sea invasion against the Roman Empire , assisted by Heruli sailors and other tribesmen .