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 Germans on the Lower Rhine - The Germans on the Upper Rhine - Spread of the Helvetian Invasion to the Interior of Gaul
The appearance of the energetic German prince in so dangerous proximity, which could not but in itself excite the most serious apprehension in the Romans, appeared still more threatening, inasmuch as it stood by no means alone. The Usipetes and Tencteri settled on the right bank of the Rhine, weary of the incessant devastation of their territory by the overbearing Suebian tribes, had, the year before Caesar arrived in Gaul (695), set out from their previous abodes to seek others at the mouth of the Rhine.
They had already taken away from the Menapii there the portion of their territory situated on the right bank, and it might be foreseen that they would make the attempt to establish themselves also on the left. Suebian bands, moreover, assembled between Cologne and Mayence, and threatened to appear as uninvited guests in the opposite Celtic canton of the Treveri.
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Reference address : https://www.ellopos.net/elpenor/rome/5-07-subjugation-west.asp?pg=55