Gaius Marius vs Quintus Petillius Cerialis

As consul, Marius opened military service to landless citizens, replacing the property-based levy with a volunteer army. He standardized equipment and training, creating a professional standing army loyal to commanders rather than the state.

Marius defeated the Teutones and Ambrones at Aquae Sextiae in Gaul. The Germanic tribes were annihilated, ending their invasion of Roman territory and securing Marius's reputation as a savior of Rome.

Marius, with proconsul Catulus, defeated the Cimbri at Vercellae in Cisalpine Gaul. The Cimbri were destroyed, ending the Cimbrian War and securing Rome's northern frontier.

Marius served an unprecedented sixth consulship amid political turmoil. He used force to suppress the tribune Saturninus and praetor Glaucia, but later lost support and went into exile in Africa.

Marius returned from exile, allied with Cinna, and marched on Rome. He captured the city and initiated a purge of his political enemies, including the execution of consul Octavius and many senators.

As legate of Legio IX Hispana, Petillius Cerialis marched to relieve the besieged colony of Camulodunum during Boudica's revolt. His force was ambushed and routed by the Iceni; Cerialis escaped with his cavalry, but the legion suffered heavy losses.

During the Year of the Four Emperors, Cerialis was sent to Gaul to crush the Batavian rebellion led by Gaius Julius Civilis. He commanded Roman forces in a series of engagements, ultimately defeating the rebels and restoring order along the Rhine frontier.

Appointed governor of Britain by Emperor Vespasian, Cerialis launched aggressive campaigns against the Brigantes in northern England. He defeated the rebel leader Venutius, captured their stronghold, and extended Roman control into what is now Yorkshire.

Petillius Cerialis held a second consulship as consul suffectus in 74 AD. This rare honor reflected his continued favor under the Flavian dynasty and his successful military and administrative career.