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
Gaius Flaminius, with the Etruscan army, was still for the moment at Arezzo, intending to move from that point towards Lucca in order to protect the vale of the Arno and the passes of the Apennines, so soon as the season should allow. But Hannibal anticipated him.
The passage of the Apennines was accomplished without much difficulty, at a point as far west as possible or, in other words, as distant as possible from the enemy; but the marshy low grounds between the Serchio and the Arno were so flooded by the melting of the snow and the spring rains, that the army had to march four days in water, without finding any other dry spot for resting by night than was supplied by piling the baggage or by the sumpter animals that had fallen.
The troops underwent unutterable sufferings, particularly the Gallic infantry, which marched behind the Carthaginians along tracks already rendered impassable: they murmured loudly and would undoubtedly have dispersed to a man, had not the Carthaginian cavalry under Mago, which brought up the rear, rendered flight impossible. The horses, assailed by a distemper in their hoofs, fell in heaps; various diseases decimated the soldiers; Hannibal himself lost an eye in consequence of ophthalmia.
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Reference address : https://www.ellopos.net/elpenor/rome/3-05-war-hannibal-cannae.asp?pg=14