Catalaunian Fields AD 451A description of Attila the Huns invasion of Gaul in AD 451, the Roman response and the eventual battle of Chalons. The battle of the Catalaunian Fields saw two massive, powerful empires square up in a conflict that was to shape the course of Eurasian history forever. For despite the Roman victory, the Roman Empire would not survive for more than 15 years following the battle, whilst the Huns, shattered and demoralised, would meet their downfall