Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
The Helvetii Sent back to Their Original Abode
The lot of the vanquished was a comparatively mild one. The Haedui were directed to concede settlements in their territory to the homeless Boii; and this settlement of the conquered foe in the midst of the most powerful Celtic cantons rendered almost the services of a Roman colony. The survivors of the Helvetii and Rauraci, something more than a third of the men that had marched forth, were naturally sent back to their former territory.
It was incorporated with the Roman province, but the inhabitants were admitted to alliance with Rome under favourable conditions, in order to defend, under Roman supremacy, the frontier along the upper Rhine against the Germans. Only the south-western point of the Helvetic canton was directly taken into the possession of the Romans, and there subsequently, on the charming shore of the Leman lake, the old Celtic town Noviodunum (now Nyon) was converted into a Roman frontier-fortress, the "Julian equestrian colony."(35)
35. -Julia Equestris-, where the last surname is to be taken as in other colonies of Caesar the surnames of sextanorum, decimanorum, etc. It was Celtic or German horsemen of Caesar, who, of course with the bestowal of the Roman or, at any rate, Latin franchise, received land-allotments there.
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Reference address : https://www.ellopos.net/elpenor/rome/5-07-subjugation-west.asp?pg=67