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
Hannibal Crosses the Apennines
It was these motives, and not the entreaties of the Gauls that he should spare their country--which would not have influenced him--that induced Hannibal now to forsake, as it were, his newly acquired basis of operations against Italy, and to transfer the scene of war to Italy itself. Before doing so he gave orders that all the prisoners should be brought before him. He ordered the Romans to be separated and loaded with chains as slaves--the statement that Hannibal put to death all the Romans capable of bearing arms, who here and elsewhere fell into his hands, is beyond doubt at least strongly exaggerated.
On the other hand, all the Italian allies were released without ransom, and charged to report at home that Hannibal waged war not against Italy, but against Rome; that he promised to every Italian community the restoration of its ancient independence and its ancient boundaries; and that the deliverer was about to follow those whom he had set free, bringing release and revenge. In fact, when the winter ended, he started from the valley of the Po to search for a route through the difficult defiles of the Apennines.
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Reference address : https://www.ellopos.net/elpenor/rome/3-05-war-hannibal-cannae.asp?pg=13