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
When the Gauls perceived this manoeuvre, they attempted to move from the coast on which they had taken up the combat with the Romans, and to gain the high seas, whither the Roman galleys could not follow them; but unhappily for them there suddenly set in a dead calm, and the immense fleet, towards the equipment of which the maritime cantons had applied all their energies, was almost wholly destroyed by the Romans. Thus was this naval battle--so far as historical knowledge reaches, the earliest fought on the Atlantic Ocean-- just like the engagement at Mylae two hundred years before,(39) notwithstanding the most unfavourable circumstances, decided in favour of the Romans by a lucky invention suggested by necessity.
39. Cf. III. II. The Romans Build a Fleet
The consequence of the victory achieved by Brutus was the surrender of the Veneti and of all Brittany. More with a view to impress the Celtic nation, after so manifold evidences of clemency towards the vanquished, by an example of fearful severity now against those whose resistance had been obstinate, than with the view of punishing the breach of treaty and the arrest of the Roman officers, Caesar caused the whole common council to be executed and the people of the Venetian canton to the last man to be sold into slavery. By this dreadful fate, as well as by their intelligence and their patriotism, the Veneti have more than any other Celtic clan acquired a title to the sympathy of posterity.
Sabinus meanwhile opposed to the levy of the coast-states assembled on the Channel the same tactics by which Caesar had in the previous year conquered the Belgic general levy on the Aisne; he stood on the defensive till impatience and want invaded the ranks of the enemy, and then managed by deceiving them as to the temper and strength of his troops, and above all by means of their own impatience, to allure them to an imprudent assault upon the Roman camp, in which they were defeated; whereupon the militia dispersed and the country as far as the Seine submitted.
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Reference address : https://www.ellopos.net/elpenor/rome/5-07-subjugation-west.asp?pg=83