The Gallic war

the long version

"The Gallic Wars were a series of military campaigns waged by the Roman proconsul Julius Caesar against several Gallic tribes, Galli being the Latin equivalent of Celt. These tribes, along with many others, made up the confederation of tribes that was the Celtic nation, or the Celtic Tribe of Tribes. Rome's war against the Gallic tribes lasted from 58 BC to 50 BC and 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 (mainly present day France and Belgium). The wars paved the way for Julius Caesar to become the sole ruler of the Roman Republic."--Wikipedia.