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
Expeditions against the Maritime Cantons - Venetian War
The turn of the Aremorican cantons came. In the autumn of 697 Publius Crassus was sent thither with a Roman corps; he induced the Veneti--who as masters of the ports of the modern Morbihan and of a respectable fleet occupied the first place among all the Celtic cantons in navigation and commerce--and generally the coast-districts between the Loire and Seine, to submit to the Romans and give them hostages. But they soon repented. When in the following winter (697-698) Roman officers came to these legions to levy requisitions of grain there, they were detained by the Veneti as counter-hostages.
The example thus set was quickly followed not only by the Aremorican cantons, but also by the maritime cantons of the Belgae that still remained free; where, as in some cantons of Normandy, the common council refused to join the insurrection, the multitude put them to death and attached itself with redoubled zeal to the national cause. The whole coast from the mouth of the Loire to that of the Rhine rose against Rome; the most resolute patriots from all the Celtic cantons hastened thither to co-operate in the great work of liberation; they already calculated on the rising of the whole Belgic confederacy, on aid from Britain, on the arrival of Germans from beyond the Rhine.
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Reference address : https://www.ellopos.net/elpenor/rome/5-07-subjugation-west.asp?pg=80