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 Hellenes 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.
Romanization of the Entire of Italy The boundary of the Alps was reached, in so far as the whole flat country on the Po was either rendered subject to the Romans, or, like the territories of the Cenomani and Veneti, was occupied by dependent allies.

It needed time, however, to reap the consequences of this victory and to Romanize the land.