Julius Caesar
Campaigns in Gaul

During the Gallic Wars, Caesar wrote his Commentaries thereon, which were acknowledged even in his time as a Latin literary masterwork. Meant to document Caesar's campaigns in his own words and maintain support in Rome for his military operations and career, he produced some ten volumes covering operations in Gaul from 58 to 52 BC. Each was likely produced in the year following the events described and was likely aimed at the general, or at least literate, population in Rome; the account is naturally partial to Caesar – his defeats are excused and victories highlighted – but it is almost the sole source for events in Gaul in this period.

Gaul in 58 BC was in the midst of some instability. Tribes had raided into Transalpine Gaul and there was an on-going struggle between two tribes in central Gaul which collaterally involved Roman alliances and politics. The divisions within the Gauls – they were no unified bloc – would be exploited in the coming years. The first engagement was in April 58 BC when Caesar prevented the migrating Helvetii from moving through Roman territory, allegedly because he feared they would unseat a Roman ally. Building a wall, he stopped their movement near Geneva and – after raising two legions – defeated them at the Battle of Bibracte before forcing them to return to their original homes. He was drawn further north responding to requests from Gallic tribes, including the Aedui, for aid against Ariovistus – king of the Suebi and a declared friend of Rome by the Senate during Caesar's own consulship – and he defeated them at the Battle of Vosges. Wintering in northeastern Gaul near the Belgae in the winter of 58–57, Caesar's forward military position triggered an uprising to remove his troops; able to eke out a victory at the Battle of the Sabis, Caesar spent much of 56 BC suppressing the Belgae and dispersing his troops to campaign across much of Gaul, including against the Veneti in what is now Brittany. At this point, almost all of Gaul – except its central regions – fell under Roman subjugation.

Seeking to buttress his military reputation, he engaged Germans attempting to cross the Rhine, which marked it as a Roman frontier; displaying Roman engineering prowess, he here built a bridge across the Rhine in a feat of engineering meant to show Rome's ability to project power. Ostensibly seeking to interdict British aid to his Gallic enemies, he led expeditions into southern Britain in 55 and 54 BC, perhaps seeking further conquests or otherwise wanting to impress readers in Rome; Britain at the time was to the Romans an "island of mystery" and "a land of wonder". He, however, withdrew from the island in the face of winter uprisings in Gaul led by the Eburones and Belgae starting in late 54 BC which ambushed and virtually annihilated a legion and five cohorts. Caesar was, however, able to lure the rebels into unfavourable terrain and routed them in battle. The next year, a greater challenge emerged with the uprising of most of central Gaul, led by Vercingetorix of the Averni. Caesar was initially defeated at Gergovia before besieging Vercingetorix at Alesia. After becoming himself besieged, Caesar won a major victory which forced Vercingetorix's surrender; Caesar then spent much of his time into 51 BC suppressing any remaining resistance.
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