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
Attitude of the Romans
Such were the consequences of the day of Cannae, in which the flower of the soldiers and officers of the confederacy, a seventh of the whole number of Italians capable of bearing arms, perished. It was a cruel but righteous punishment for the grave political errors with which not merely some foolish or miserable individuals, but the Roman people themselves, were justly chargeable. A constitution adapted for a small country town was no longer suitable for a great power; it was simply impossible that the question as to the leadership of the armies of the city in such a war should be left year after year to be decided by the Pandora's box of the balloting-urn.
As a fundamental revision of the constitution, if practicable at all, could not at least be undertaken now, the practical superintendence of the war, and in particular the bestowal and prolongation of the command, should have been at once left to the only authority which was in a position to undertake it--the senate--and there should have been reserved for the comitia the mere formality of confirmation. The brilliant successes of the Scipios in the difficult arena of Spanish warfare showed what might in this way be achieved.
But political demagogism, which was already gnawing at the aristocratic foundations of the constitution, had seized on the management of the Italian war. The absurd accusation, that the nobles were conspiring with the enemy without, had made an impression on the "people." The saviours to whom political superstition looked for deliverance, Gaius Flaminius and Gaius Varro, both "new men" and friends of the people of the purest dye, had accordingly been empowered by the multitude itself to execute the plans of operations which, amidst the approbation of that multitude, they had unfolded in the Forum; and the results were the battles on the Trasimene lake and at Cannae.
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Reference address : https://www.ellopos.net/elpenor/rome/3-05-war-hannibal-cannae.asp?pg=44