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
The Roman main army of four legions under the two consuls, Quintus Fabius and Marcus Marcellus, was on the point of attempting to recover Capua. To these there fell to be added on the Roman side the reserve of two legions in the capital, the garrisons placed in all the seaports--Tarentum and Brundisium having been reinforced by a legion on account of the Macedonian landing apprehended there--and lastly the strong fleet which had undisputed command of the sea.
If we add to these the Roman armies in Sicily, Sardinia, and Spain, the whole number of the Roman forces, even apart from the garrison service in the fortresses of Lower Italy which was provided for by the colonists occupying them, may be estimated at not less than 200,000 men, of whom one-third were newly enrolled for this year, and about one-half were Roman citizens.
It may be assumed that all the men capable of service from the 17th to the 46th year were under arms, and that the fields, where the war permitted them to be tilled at all, were cultivated by the slaves and the old men, women, and children. As may well be conceived, under such circumstances the finances were in the most grievous embarrassment; the land-tax, the main source of revenue, came in but very irregularly.
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Reference address : https://www.ellopos.net/elpenor/rome/3-06-war-hannibal-cannae-zama.asp?pg=50