 Following the defeat of the Huns by a Roman-Gothic alliance, Ferreolus resisted the attempts of Visigothic king Thorismund to take advantage of the situation to obtain more territory or privileges in 452–453 when that king besieged Arles.He was associated with Thaumastus and Petronius in conducting the impeachment of Arvandus, a successor in the Gallic Prefecture who had behaved extortionately toward the people of Gaul and who had written a letter to Visigothic King Euric encouraging that monarch to break with his allegiance to Emperor Anthemius and partition Gaul with the Burgundians, presumably with Arvandus' connivance.This prosecution was successful in obtaining a conviction though Arvandus was reprieved, to some extent, it would appear, through the good offices of Sidonius Apollinaris, from execution and he was merely exiled.