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
Carthaginian Expedition to Sicily - The Carthaginian Troops Destroyed Conquest of Syracuse
In the meanwhile Carthage, which hitherto had only supported the Syracusans with her fleets, on receiving news of their renewed rising in arms against the Romans had despatched a strong land army under Himilco to Sicily, which landed without interruption at Heraclea Minoa and immediately occupied the important town of Agrigentum. To effect a junction with Himilco, the bold and able Hippocrates marched forth from Syracuse with an army: the position of Marcellus between the garrison of Syracuse and the two hostile armies began to be critical.
With the help of some reinforcements, however, which arrived from Italy, he maintained his position in the island and continued the blockade of Syracuse. On the other hand, the greater portion of the small inland towns were driven to the armies of the Carthaginians not so much by the armies of the enemy, as by the fearful severity of the Roman proceedings in the island, more especially the slaughter of the citizens of Enna, suspected of a design to revolt, by the Roman garrison which was stationed there.
In 542 the besiegers of Syracuse during a festival in the city succeeded in scaling a portion of the extensive outer walls that had been deserted by the guard, and in penetrating into the suburbs which stretched from the "island" and the city proper on the shore (Achradina) towards the interior.
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Reference address : https://www.ellopos.net/elpenor/rome/3-06-war-hannibal-cannae-zama.asp?pg=16