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
Some smaller cantons gave in their submission; but the Sugambri, against whom the expedition was primarily directed, withdrew, on the approach of the Roman army, with those under their protection into the interior. In like manner the powerful Suebian canton which oppressed the Ubii--presumably the same which subsequently appears under the name of the Chatti--caused the districts immediately adjoining the Ubian territory to be evacuated and the non-combatant portion of the people to be placed in safety, while all the men capable of arms were directed to assemble at the centre of the canton.
The Roman general had neither occasion nor desire to accept this challenge; his object--partly to reconnoitre, partly to produce an impressive effect if possible upon the Germans, or at least on the Celts and his countrymen at home, by an expedition over the Rhine--was substantially attained; after remaining eighteen days on the right bank of the Rhine he again arrived in Gaul and broke down the Rhine bridge behind him (699).
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Reference address : https://www.ellopos.net/elpenor/rome/5-07-subjugation-west.asp?pg=90