The names of the Tigurini and the Helvetii had retained a connotation of a "barbarian" threat from the north for the Romans, employed by Julius Caesar as a motivation for his expedition to Gaul by suggesting that these tribes were "on the move again". In 58 BCE the Helvetii encountered the armies of Caesar, and were defeated and massacred in the battles of the Arar and the Bibracte, allegedly leaving 228,000 dead. These battles were the initial events in the Gallic Wars, fought between 58 and 49 BCE.