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
Scipio in the Valley of the Po - Conflict on the Ticino - The Armies at Placentia
Scipio, who, with an army considerably smaller and very weak in cavalry, had the difficult task of preventing the advance of the superior force of the enemy and of repressing the movements of insurrection which everywhere were spreading among the Celts, had crossed the Po presumably at Placentia, and marched up the river to meet the enemy, while Hannibal after the capture of Turin marched downwards to relieve the Insubres and Boii.
In the plain between the Ticino and the Sesia, not far from Vercelli, the Roman cavalry, which had advanced with the light infantry to make a reconnaissance in force, encountered the Punic cavalry sent out for the like purpose, both led by the generals in person. Scipio accepted battle when offered, notwithstanding the superiority of the enemy; but his light infantry, which was placed in front of the cavalry, dispersed before the charge of the heavy cavalry of the enemy, and while the latter engaged the masses of the Roman horsemen in front, the light Numidian cavalry, after having pushed aside the broken ranks of the enemy's infantry, took the Roman horsemen in flank and rear.
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Reference address : https://www.ellopos.net/elpenor/rome/3-05-war-hannibal-cannae.asp?pg=4