sentences:  According to Jordanes, Sangiban had promised Attila before the Battle of Châlons to open the city gates and deliver Aurelianum to the Huns.Suspecting this, the Romans and Visigoths put Sangiban in the center of the line opposing the Huns, where they could prevent him from defecting.Thus the Alans bore the main brunt of the Hunnic assault, while the Goths were able to flank the Huns and ultimately drive them back.