Julius Caesar stood at the center of a political storm in 59 BC when he assumed the consulship, the highest office in the Roman Republic. The financial burdens of holding that office left him with significant debts that threatened his future career. To secure his position as proconsul over Cisalpine Gaul and Illyricum, he relied on the First Triumvirate alliance comprising Marcus Licinius Crassus and Pompey. When Metellus Celer died unexpectedly, Caesar gained control of Transalpine Gaul through the suggestion of Pompey and his father-in-law Lucius Calpurnius Piso Caesoninus. This five-year governorship allowed him to wage war without fear of command turnover typical of one-year terms. His four veteran legions included Legio VII, Legio VIII, Legio IX Hispana, and Legio X, which he had previously commanded against the Lusitanians in 61 BC. Caesar needed to conquer territories to pay off his debts and boost his public image. He may have initially planned a campaign against Dacia in the Balkans instead of Gaul. A mass migration of Gallic tribes in 58 BC provided a convenient casus belli for his ambitions. Historian Kate Gilliver describes this as an aggressive war of expansion led by a general seeking to advance his career.
Military Strategies And Tactics
The Roman army was extremely disciplined and kept standing between conflicts, consisting mostly of heavy infantry. Auxiliary units were fielded from less disciplined allies, including some Gauls who joined later in the war. The Gauls formed an irregular and less disciplined fighting force where individual warriors outfitted themselves like Romans did. Wealthier soldiers possessed better equipment while poorer ones struggled with inferior gear. Unlike the Romans, the Gauls were a warrior culture that prized acts of bravery and individual courage. Frequent raiding of neighboring tribes kept their fighting skills sharp throughout the region. They carried longer swords than Romans and possessed far superior cavalry forces. The Gauls were generally taller than Romans, giving them a reach advantage in combat despite Roman discipline. Both sides used archers and slingers though little is known about Gallic battle strategy effectiveness. Engagement in pitched battle was frequent among Gauls to prove bravery rather than avoid direct conflict. While Gauls had more flair in combat with intricately decorated armor or even fought naked, Roman formation gave them hand-to-hand advantages. The Wars cemented the Roman use of the cohort instead of the maniple system first described by Polybius in 206 BC. A cohort held 480 men combining rich and poor fighters into single uniform units increasing overall morale. Ten cohorts combined with small cavalry units engineers and officers made a legion of around 5,000 men.