 In 109 BC, they defeated a Roman army under the consul Marcus Junius Silanus, who was the commander of Gallia Narbonensis.In 107 BC they defeated another Roman army under the consul Gaius Cassius Longinus, who was killed at the Battle of Burdigala (modern day Bordeaux) against the Tigurini, who were allies of the Cimbri.It was not until 105 BC that they planned an attack on the Roman Republic itself.