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
But perhaps nothing so clearly evinces the decay of genuine pride and genuine honour in high and low alike as the hunting after insignia and titles, which appeared under different forms of expression, but with substantial identity of character, among all ranks and classes. So urgent was the demand for the honour of a triumph that there was difficulty in upholding the old rule, which accorded a triumph only to the ordinary supreme magistrate who augmented the power of the commonwealth in open battle, and thereby, it is true, not unfrequently excluded from that honour the very authors of the most important successes.
There was a necessity for acquiescence, while those generals, who had in vain solicited, or had no prospect of attaining, a triumph from the senate or the burgesses, marched in triumph on their own account at least to the Alban Mount (first in 523). No combat with a Ligurian or Corsican horde was too insignificant to be made a pretext for demanding a triumph. In order to put an end to the trade of peaceful triumphators, such as were the consuls of 574, the granting of a triumph was made to depend on the producing proof of a pitched battle which had cost the lives of at least 5000 of the enemy; but this proof was frequently evaded by false bulletins--already in houses of quality many an enemy's armour might be seen to glitter, which had by no means come thither from the field of battle.
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Reference address : https://www.ellopos.net/elpenor/rome/3-11-government-governed.asp?pg=59