Celtic warfare
The "Gallic Wars" were a series of military campaigns waged by the Roman proconsul Julius Caesar against Gallic tribes, lasting from 58 BC to 51 BC. The Romans would also raid Britannia and Germania, but these expeditions never developed into full-scale invasions. The Gallic Wars culminated in the decisive Battle of Alesia in 52 BC, in which a complete Roman victory resulted in the expansion of the Roman Republic over the whole of Gaul. The wars paved the way for Caesar to become the sole ruler of the Roman Republic.
Commentarii de Bello Gallico
Most English editions of Asterix begin with the prelude: "The year is 50 BC. Gaul is entirely occupied by the Romans. Well not entirely! One small village of indomitable Gauls still holds out against the invaders." In the 36th book of the Asterix series, "Asterix and the Missing Scroll", a fictitious and supposedly censored chapter from Caesar's "Commentaries on the Gallic War" forms the basis for the story.