I believe that Julius Cesar did actually the opposite, he denied pass to the helvetii across the roman territories, in order to incite them to conflict.
The helvetii turned their backs and tried another road in order not to start a war with the romans.
So, good old Julius started to chase the helvetii through aeduii lands, that is, outside his province, and in Bribracte he crushed the tribes and forced them (or what remained of the helvetii) to return to helvetia...
Though, i dunno why he aeduii have a town in Cisalpine gaul, so far from they heartland...
Was that cisalpine tribe allied with the aeduii?

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