In 105, Caepio suffered a crushing defeat from the Cimbri at Arausio (Orange) on the Rhone, which was looked upon as a punishment for his sacrilege; hence the proverb Aurum Tolosanum habet, of an act involving disastrous consequences.
From 104 to for he served again under Marius in the war with the Cimbri and Teutones and fought in the last great battle in the Raudian plains near Verona.
Ridgeway (Early Age of Greece, 1901) considers that the Belgic tribes were Cimbri, "who had moved directly across the Rhine into north-eastern Gaul."
In 101 the Cimbri were defeated on the Raudine plain, near Vercellae, by the united armies of Catulus and Marius.
Marius, on his return to Rome after his victory over the Cimbri, finding himself isolated in the senate, entered into a compact with Saturninus and his ally C. Servilius Glaucia, and the three formed a kind of triumvirate, supported by the veterans of Marius and the needy rabble.