Gallic Wars
The Gallic Wars were a series of military campaigns waged by the Roman proconsul Julius Caesar against several Gallic tribes. Rome's war against the Gallic tribes lasted from 58 BC to 50 BC and culminated in the decisive Battle of Alesia in 52 BC, in which a complete Roman victory resulted in the expansion of the Roman Republic over the whole of Gaul (mainly present-day France and Belgium). While militarily just as strong as the Romans, the internal division between the Gallic tribes helped ease victory for Caesar, and Vercingetorix's attempt to unite the Gauls against Roman invasion came too late. The wars paved the way for Julius Caesar to become the sole ruler of the Roman Republic.
Gallic Wars
Caesar was across the Alps in Italy when he received the news. With only a single legion in Transalpine Gaul, the endangered province, he immediately hurried to Geneva and ordered a levy of several auxiliary units and the destruction of the Rhone bridge. The Helvetii sent an embassy to negotiate a peaceful passage, promising to do no harm. Caesar stalled the negotiations for fifteen days, and used the time to fortify his position with a rampart nineteen miles long and a parallel trench (De Bello Gallico, I, 7 and 8).
When the embassy returned, Caesar refused their request and warned them that any forceful attempt to cross the river would be opposed. Several attempts were quickly beaten off. The Helvetii turned back and entered negotiations with the Sequani, and with Dumnorix of the Aeduans, for an alternate route.(De Bello Gallico, I, 8 and 9).