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
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.