The legion was used by Emperor Alexander Severus in his 235 campaign against the Sassanids. Later the legion would be involved in Alexander Severus' campaign on the Rhine Frontier. It was almost certainly involved in Gallienus's wars against the Franks in the 250s. L. Petronius Taurus Volusianus, who later became Praetorian Prefect in 260 and Urban prefect in the mid-260s, was "Primus Pilus" of the legion at this time. It supported the Gallic Empire of Postumus (260–274) and no doubt suffered great losses when Aurelian overthrew Tetricus I in a bloody battle at the Catalaunian Fields (Châlons-en-Champagne) in 274.