 Complete the following phrase:  Upon arriving in Gaul in 58 BC Caesar opposed the migration militarily. He built fortifications at Lake Geneva and either requested or demanded that the Aedui, who had been named friend and ally of Rome, supply his soldiers with grain. Dumnorix was very popular and had a large contingent of person retainers. He used his influence to delay the grain supply. Caesar forced the Helvetii to take an alternate path, then inflicted a devastating defeat on the tribe at the 