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
Fresh Violations of the Rhine-Boundary by the Germans - The Usipetes and Tencteri
One of the objects which Caesar had proposed to himself-- the subjugation of Gaul--had been in substance, with exceptions scarcely worth mentioning, attained so far as it could be attained at all by the sword. But the other half of the work undertaken by Caesar was still far from being satisfactorily accomplished, and the Germans had by no means as yet been everywhere compelled to recognize the Rhine as their limit. Even now, in the winter of 698-699, a fresh crossing of the boundary had taken place on the lower course of the river, whither the Romans had not yet penetrated. The German tribes of the Usipetes and Tencteri whose attempts to cross the Rhine in the territory of the Menapii have been already mentioned,(41) had at length, eluding the vigilance of their opponents by a feigned retreat, crossed in the vessels belonging to the Menapii--an enormous host, which is said, including women and children, to have amounted to 430,000 persons.
41. Cf. V. VII. The Germans on the Lower Rhine
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Reference address : https://www.ellopos.net/elpenor/rome/5-07-subjugation-west.asp?pg=87