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.
Gallic Wars
By 58 BC, the Helvetii were well on their way in the planning and provisioning for a mass migration under the leadership of Orgetorix. Caesar mentions as an additional reason their not being able to in turn raid for plunder themselves due to their location. (De Bello Gallico, I, 2) They planned to travel across Gaul to the west coast, a route that would have taken them through lands of the Aedui, a Roman ally, and the Roman province of Transalpine Gaul.