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
German Tribes on the Left Bank of the Rhine
But the Germans had not remained stationary at the Rhine. The march of the Cimbrian and Teutonic host, composed, as respects its flower, of German tribes, which had swept with such force fifty years before over Pannonia, Gaul, Italy, and Spain, seemed to have been nothing but a grand reconnaissance. Already different German tribes had formed permanent settlements to the west of the Rhine, especially of its lower course; having intruded as conquerors, these settlers continued to demand hostages and to levy annual tribute from the Gallic inhabitants in their neighbourhood, as if from subjects.
Among these German tribes were the Aduatuci, who from a fragment of the Cimbrian horde(28) had grown into a considerable canton, and a number of other tribes afterwards comprehended under the name of the Tungri on the Maas in the region of Liege; even the Treveri (about Treves) and the Nervii (in Hainault), two of the largest and most powerful peoples of this region, are directly designated by respectable authorities as Germans.
28. Cf. IV. V. Teutones in the Province of Gaul
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Reference address : https://www.ellopos.net/elpenor/rome/5-07-subjugation-west.asp?pg=48