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
It was needful accordingly to maintain in Spain a Roman army of four strong legions, or about 40,000 men, year after year; besides which the general levy had often to be called out in the districts occupied by Rome, to reinforce the legions. This was of great importance for two reasons: it was in Spain first, at least first on any larger scale, that the military occupation of the land became continuous; and it was there consequently that the service acquired a permanent character.
The old Roman custom of sending troops only where the exigencies of war at the moment required them, and of not keeping the men called to serve, except in very serious and important wars, under arms for more than a year, was found incompatible with the retention of the turbulent and remote Spanish provinces beyond the sea; it was absolutely impossible to withdraw the troops from these, and very dangerous even to relieve them extensively.
The Roman burgesses began to perceive that dominion over a foreign people is an annoyance not only to the slave, but to the master, and murmured loudly regarding the odious war-service of Spain. While the new generals with good reason refused to allow the relief of the existing corps as a whole, the men mutinied and threatened that, if they were not allowed their discharge, they would take it of their own accord.
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Reference address : https://www.ellopos.net/elpenor/rome/3-07-peace-hannibal-third-period.asp?pg=31