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
The Celts Conquered by Rome
In this way undoubtedly the river cut off their retreat, and their way homeward lay through the hostile army. But the superiority of the Roman arms and of Roman discipline achieved the victory, and the army cut its way through: once more the Roman tactics had redeemed the blunders of the general. The victory was due to the soldiers and officers, not to the generals, who gained a triumph only through popular favour in opposition to the just decree of the senate. Gladly would the Insubres have made peace; but Rome required unconditional subjection, and things had not yet come to that pass.
They tried to maintain their ground with the help of their northern kinsmen; and, with 30,000 mercenaries whom they had raised amongst these and their own levy, they received the two consular armies advancing once more in the following year (532) from the territory of the Cenomani to invade their land. Various obstinate combats took place; in a diversion, attempted by the Insubres against the Roman fortress of Clastidium (Casteggio, below Pavia), on the right bank of the Po, the Gallic king Virdumarus fell by the hand of the consul Marcus Marcellus.
But, after a battle already half won by the Celts but ultimately decided in favour of the Romans, the consul Gnaeus Scipio took by assault Mediolanum, the capital of the Insubres, and the capture of that town and of Comum terminated their resistance. Thus the Celts of Italy were completely vanquished, and as, just before, the Romans had shown to the Greeks in the war with the pirates the difference between a Roman and a Greek sovereignty of the seas, so they had now brilliantly demonstrated that Rome knew how to defend the gates of Italy against freebooters on land otherwise than Macedonia had guarded the gates of Greece, and that in spite of all internal quarrels Italy presented as united a front to the national foe, as Greece exhibited distraction and discord.
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Reference address : https://www.ellopos.net/elpenor/rome/3-03-extension-italy.asp?pg=37