In 58 BC the nobleman Orgetorix instigated a new Helvetian migration, in which the entire tribe was to leave their territory (which is now described as corresponding more or less to the Swiss plateau) and establish supremacy over all of Gaul. They marched from their villages, but were stalled by Julius Caesar on the banks of the Rhône. The Helvetii then marched around and across the Jura Mountains, to an area near the Aeduan oppidum Bibracte. There Caesar caught up and defeated the Helvetii in the Battle of Bibracte. This resulted in the Helvetii's retreat and the capture of most of their baggage by the Romans. Following their surrender the Helvetii became "foederati", an allied "civitas" required to provide soldiers, but not granted Roman citizenship.