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
Thus began, a few months after the death of Drusus, in the winter of 663-4, the struggle--as one of the coins of the insurgents represents it--of the Sabellian ox against the Roman she-wolf. Both sides made zealous preparations: in Italia great stores of arms, provisions, and money were accumulated; in Rome the requisite supplies were drawn from the provinces and particularly from Sicily, and the long-neglected walls were put in a state of defence against any contingency. The forces were in some measure equally balanced.
The Romans filled up the blanks in their Italian contingents partly by increased levies from the burgesses and from the inhabitants--already almost wholly Romanized-- of the Celtic districts on the south of the Alps, of whom 10,000 served in the Campanian army alone,(13) partly by the contingents of the Numidians and other transmarine nations; and with the aid of the free cities in Greece and Asia Minor they collected a war fleet.(14)
13. The bullets found at Asculum show that the Gauls were very numerousalso in the army of Strabo.
14. We still have a decree of the Roman senate of 22 May 676, which grants honours and advantages on their discharge to three Greek ship- captains of Carystus, Clazomenae, and Miletus for faithful services renderedsince the commencement of the Italian war (664). Of the same nature is the account of Memnon, that two triremes were summoned from Heraclea on the Black Sea for the Italian war, and that they returned in the eleventh year with rich honorary gifts.
On both sides, without reckoning garrisons, as many as 100,000 soldiers were brought into the field,(15) and in the ability of their men, in military tactics and armament, the Italians were nowise inferior to the Romans.
15. That this statement of Appian is not exaggerated, is shown by the bullets found at Asculum which name among others the fifteenth legion.
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Reference address : https://www.ellopos.net/elpenor/rome/4-07-sulpician-revolution.asp?pg=25