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 the general, who was wholly unacquainted with war, sustained defeats so severe under the walls of the two cities (613, 614), that he preferred at length to procure by means of negotiations the peace which he could not compel. With Termantia a definitive agreement must have taken place. In the case of the Numantines the Roman general liberated their captives, and summoned the community under the secret promise of favourable treatment to surrender to him at discretion. The Numantines, weary of the war, consented, and the general actually limited his demands to the smallest possible measure.
Prisoners of war, deserters, and hostages were delivered up, and the stipulated sum of money was mostly paid, when in 615 the new general Marcus Popillius Laenas arrived in the camp. As soon as Pompeius saw the burden of command devolve on other shoulders, he, with a view to escape from the reckoning that awaited him at Rome for a peace which was according to Roman ideas disgraceful, lighted on the expedient of not merely breaking, but of disowning his word; and when the Numantines came to make their last payment, in the presence of their officers and his own he flatly denied the conclusion of the agreement. The matter was referred for judicial decision to the senate at Rome.
While it was discussed there, the war before Numantia was suspended, and Laenas occupied himself with an expedition to Lusitania where he helped to accelerate the catastrophe of Viriathus, and with a foray against the Lusones, neighbours of the Numantines. When at length the decision of the senate arrived, its purport was that the war should be continued--the state became thus a party to the knavery of Pompeius.
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Reference address : https://www.ellopos.net/elpenor/rome/4-01-gracchi.asp?pg=20