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 Marches toward Rome
Hannibal tried a further expedient, the last which occurred to his inventive genius, to save the important city. After giving the Campanians information of his intention and exhorting them to hold out, he started with the relieving army from Capua and took the road for Rome. With the same dexterous boldness which he had shown in his first Italian campaigns, he threw himself with a weak army between the armies and fortresses of the enemy, and led his troops through Samnium and along the Valerian Way past Tibur to the bridge over the Anio, which he passed and encamped on the opposite bank, five miles from the city.
The children's children of the Romans still shuddered, when they were told of "Hannibal at the gate"; real danger there was none. The country houses and fields in the neighbourhood of the city were laid waste by the enemy; the two legions in the city, who went forth against them, prevented the investment of the walls. Besides, Hannibal had never expected to surprise Rome by a -coup de main-, such as Scipio soon afterwards executed against New Carthage, and still less had he meditated a siege in earnest; his only hope was that in the first alarm part of the besieging army of Capua would march to Rome and thus give him an opportunity of breaking up the blockade. Accordingly after a brief stay he departed.
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Reference address : https://www.ellopos.net/elpenor/rome/3-06-war-hannibal-cannae-zama.asp?pg=58