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
Caesar in Spain
The campaign which Caesar undertook in 693 in Further Spain, may be in some sense included among the enterprises which aimed at the subjugation of the west. Long as Spain had obeyed the Romans, its western shore had remained substantially independent of them even after the expedition of Decimus Brutus against the Callaeci(1), and they had not even set foot on the northern coast; while the predatory raids, to which the subject provinces found themselves continually exposed from those quarters, did no small injury to the civilization and Romanizing of Spain.
1. Cf. IV. I. The Callaeci Conquered
Against these the expedition of Caesar along the west coast was directed. He crossed the chain of the Herminian mountains (Sierra de Estrella) bounding the Tagus on the north; after having conquered their inhabitants and transplanted them in part to the plain, he reduced the country on both sides of the Douro and arrived at the northwest point of the peninsula, where with the aid of a flotilla brought up from Gades he occupied Brigantium (Corunna). By this means the peoples adjoining the Atlantic Ocean, Lusitanians and Callaecians, were forced to acknowledge the Roman supremacy, while the conqueror was at the same time careful to render the position of the subjects generally more tolerable by reducing the tribute to be paid to Rome and regulating the financial affairs of the communities.
But, although in this military and administrative debut of the great general and statesman the same talents and the same leading ideas are discernible which he afterwards evinced on a greater stage, his agency in the Iberian peninsula was much too transient to have any deep effect; the more especially as, owing to its physical and national peculiarities, nothing but action steadily continued for a considerable time could exert any durable influence there.
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Reference address : https://www.ellopos.net/elpenor/rome/5-07-subjugation-west.asp?pg=5