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
That partial defection itself was certainly not high treason, but merely the result of shortsightedness and exhaustion; beyond doubt these same towns would have rejected with horror an alliance with the Phoenicians. But still there was a variance between Romans and Latins, which did not fail injuriously to react on the subject population of these districts.
A dangerous ferment immediately showed itself in Arretium; a conspiracy organized in the interest of Hannibal among the Etruscans was discovered, and appeared so perilous that Roman troops were ordered to march thither. The military and police suppressed this movement without difficulty; but it was a significant token of what might happen in those districts, if once the Latin strongholds ceased to inspire terror.
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Reference address : https://www.ellopos.net/elpenor/rome/3-06-war-hannibal-cannae-zama.asp?pg=69