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.
Marcus Claudius Marcellus
Following the end of the First Punic War, in which Marcellus fought as a soldier, the Gauls of northern Italy declared war on Rome in 225 BC. In the fourth and final year of the war, Marcellus was elected consul with Gnaeus Cornelius Scipio Calvus. The previous consuls had pushed the Insubrians, the primary Gallic tribe involved, all the way up to the Po River. Following such terrible defeats, the Insubrians surrendered, but Marcellus, not yet consul, persuaded the two acting consuls not to accept the terms of peace. As Marcellus and his colleague were ushered into office as the new consuls, the Insubrians mustered 30,000 of their Gallic allies, the Gaesatae, to fight the Romans. Marcellus invaded Insubrian lands up to the Po River, just as the previous consuls had done. From here, the Gauls sent 10,000 men across the Po and attacked Clastidium, a Roman stronghold, to divert the Roman attacks. This battlefield was the stage for Marcellus’ confrontation with the Gallic king, Viridomarus, which cemented his place in history.