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
In a sally he even repulsed Hannibal in person with considerable loss; a success which, as the first defeat sustained by Hannibal, was of far more importance from its moral effect than from its material results. In Campania indeed, Nuceria, Acerrae, and, after an obstinate siege prolonged into the following year (539), Casilinum also, the key of the Volturnus, were conquered by Hannibal, and the severest punishments were inflicted on the senates of these towns which had adhered to Rome. But terror is a bad weapon of proselytism; the Romans succeeded, with comparatively trifling loss, in surmounting the perilous moment of their first weakness.
The war in Campania came to a standstill; then winter came on, and Hannibal took up his quarters in Capua, the luxury of which was by no means fraught with benefit to his troops who for three years had not been under a roof. In the next year (539) the war acquired another aspect. The tried general Marcus Marcellus, Tiberius Sempronius Gracchus who had distinguished himself in the campaign of the previous year as master of the horse to the dictator, and the veteran Quintus Fabius Maximus, took--Marcellus as proconsul, the two others as consuls--the command of the three Roman armies which were destined to surround Capua and Hannibal; Marcellus resting on Nola and Suessula, Maximus taking a position on the right bank of the Volturnus near Cales, and Gracchus on the coast near Liternum, covering Neapolis and Cumae.
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Reference address : https://www.ellopos.net/elpenor/rome/3-06-war-hannibal-cannae-zama.asp?pg=6