Siding with prominent local allies such as the Aedui, Caesar would justify wars that took him all over northwest Europe, fighting various peoples including the Gauls, the Belgae, the Aquitani ...
Additionally, he defeated the Belgae in 57 BCE and the Aquitani in 56 BCE. The end of his campaign in Gaul began in 55 BCE when, after defeating the Usipetri, Sugambri, and Tencteri, Caesar ...