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
And with Spain
To gain communication with Spain, moreover, Publius Crassus was sent in the following year (698) to Aquitania with instructions to compel the Iberian tribes dwelling there to acknowledge the Roman rule. The task was not without difficulty; the Iberians held together more compactly than the Celts and knew better than these how to learn from their enemies.
The tribes beyond the Pyrenees, especially the valiant Cantabri, sent a contingent to their threatened countrymen; with this there came experienced officers trained under the leadership of Sertorius in the Roman fashion, who introduced as far as possible the principles of the Roman art of war, and especially of encampment, among the Aquitanian levy already respectable from its numbers and its valour. But the excellent officer who led the Romans knew how to surmount all difficulties, and after some hardly-contested but successful battles he induced the peoples from the Garonne to the vicinity of the Pyrenees to submit to the new masters.
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Reference address : https://www.ellopos.net/elpenor/rome/5-07-subjugation-west.asp?pg=86