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
Duty required that the senate, which now of course understood its task better than when it recalled half the army of Regulus from Africa, should take into its hands the management of affairs, and should oppose such mischievous proceedings; but when the first of those two defeats had for the moment placed the rudder in its hands, it too had hardly acted in a manner unbiassed by the interests of party. Little as Quintus Fabius may be compared with these Roman Cleons, he had yet conducted the war not as a mere military leader, but had adhered to his rigid attitude of defence specially as the political opponent of Gaius Flaminius; and in the treatment of the quarrel with his subordinate, had done what he could to exasperate at a time when unity was needed.
The consequence was, first, that the most important instrument which the wisdom of their ancestors had placed in the hands of the senate just for such cases--the dictatorship--broke down in his hands; and, secondly--at least indirectly--the battle of Cannae. But the headlong fall of the Roman power was owing not to the fault of Quintus Fabius or Gaius Varro, but to the distrust between the government and the governed--to the variance between the senate and the burgesses. If the deliverance and revival of the state were still possible, the work had to begin at home with the re-establishment of unity and of confidence.
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Reference address : https://www.ellopos.net/elpenor/rome/3-05-war-hannibal-cannae.asp?pg=45