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
It was this second division, which in the summer of 652 once more crossed the Rhone without hindrance, and on its left bank resumed, after a pause of nearly three years, the struggle with the Romans. Marius awaited them in a well-chosen and well-provisioned camp at the confluence of the Isere with the Rhone, in which position he intercepted the passage of the barbarians by either of the only two military routes to Italy then practicable, that over the Little St. Bernard, and that along the coast.
The Teutones attacked the camp which obstructed their passage; for three consecutive days the assault of the barbarians raged around the Roman entrenchments, but their wild courage was thwarted by the superiority of the Romans in fortress-warfare and by the prudence of the general. After severe loss the bold associates resolved to give up the assault, and to march onward to Italy past the camp.
For six successive days they continued to defile--a proof of the cumbrousness of their baggage still more than of the immensity of their numbers. The general permitted the march to proceed without attacking them.
We can easily understand why he did not allow himself to be led astray by the insulting inquiries of the enemy whether the Romans had no commissions for their wives at home; but the fact, that he did not take advantage of this audacious defiling of the hostile columns in front of the concentrated Roman troops for the purpose of attack, shows how little he trusted his unpractised soldiers.
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Reference address : https://www.ellopos.net/elpenor/rome/4-05-peoples-north.asp?pg=45