Battle of Alesia
Caesar engaged in the Gallic Wars (58–50 BC), which led to his conquest of Gaul beyond Gallia Narbonensis. When the Helvetii, a federation of tribes from what is now Switzerland, planned a migration to the Atlantic coast through Gaul, Caesar went to Geneva and forbade the Helvetii to move into Gaul. While he went to Gallia Cisalpina to collect three other legions, the Helvetii attacked the territories of the Aedui, Ambarri, and Allobroges, three Gallic tribes, which called for Caesar’s help. Caesar and his Gallic allies defeated the Helvetii. The Gallic tribes then asked for Caesar to intervene against an invasion by the Suebi, a Germanic tribe. Caesar defeated the Suebi. In 57 BC he intervened in intra-Gallic conflicts and marched on the Belgae of northern Gaul. From then on he conquered the Gallic peoples one by one. His successes in Gaul brought Caesar political prestige in Rome and great wealth through the spoils of wars and the sale of war captives as slaves.
Battle of Lake Vadimo (283 BC)
Appian wrote about the wars between Rome and the Gauls in Italy and Gaul and Julius Caesar’s conquest of Gaul (Gallic Wars 1, 2, and 3 of his Roman History). However, his work has survived only in fragments which are often short and sometimes do not shed enough light on events. He wrote about events in 283 BC and mentioned battle fought against the Romans by a Gallic and Etruscan force without mentioning where it was. This fragment concentrates on an incident which involved Roman ambassadors and Roman actions in the ager Gallicus (the land of the Senones).