A major battle in this war occurred at (+)
This war started because of an attempt by the Helvetii tribe to migrate into the namesake territory. During this war, the winning general repeatedly built and destroyed temporary bridges over the Rhine river, to demonstrate his power and intimidate the Germans into not intervening. A major battle in this war occurred at (+) Gergovia, while the final battle of this war was the unsuccessful siege of the fortress of Alesia. A first hand account of this war famously begins by noting that the namesake province is divided into three parts, and after this war the winning general crossed the (*) Rubicon into Italy. For 10 points, name this war in which Vercingetorix was defeated by Julius Caesar, and in which the Roman Republic conquered modern France.
This war started because of an attempt by the Helvetii tribe to migrate into the namesake territory.
{Gallic Wars}