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
While the southern province was scourged by Viriathus and the Lusitanians, a second and not less serious war had, not without their help, broken out in the northern province among the Celtiberian nations. The brilliant successes of Viriathus induced the Arevacae likewise in 610 to rise against the Romans; and for this reason the consul Quintus Caecilius Metellus, who was sent to Spain to relieve Maximus Aemilianus, did hot proceed to the southern province, but turned against the Celtiberians. In the contest with them, and more especially during the siege of the town of Contrebia which was deemed impregnable, he showed the same ability which he had displayed in vanquishing the Macedonian pretender; after his two years' administration (611, 612) the northern province was reduced to obedience.
The two towns of Termantia and Numantia alone had not yet opened their gates to the Romans; but in their case also a capitulation had been almost concluded, and the greater part of the conditions had been fulfilled by the Spaniards. When required, however, to deliver up their arms, they were restrained like Viriathus by their genuine Spanish pride in the possession of a well- wielded sword, and they resolved to continue the war under the daring Megaravicus. It seemed folly: the consular army, the command of which was taken up in 613 by the consul Quintus Pompeius, was four times as numerous as the whole population capable of bearing arms in Numantia.
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Reference address : https://www.ellopos.net/elpenor/rome/4-01-gracchi.asp?pg=19