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's Position at Ruspina
Caesar, whom this day had fully convinced of the difficulty of the impending war, would not again expose his soldiers untried and discouraged by the new mode of fighting to any such attack, but awaited the arrival of his veteran legions. The interval was employed in providing some sort of compensation against the crushing superiority of the enemy in the weapons of distant warfare. The incorporation of the suitable men from the fleet as light horsemen or archers in the land-army could not be of much avail. The diversions which Caesar suggested were somewhat more effectual.
He succeeded in bringing into arms against Juba the Gaetulian pastoral tribes wandering on the southern slope of the great Atlas towards the Sahara; for the blows of the Marian and Sullan period had reached even to them, and their indignation against Pompeius, who had at that time made them subordinate to the Numidian kings,(48) rendered them from the outset favourably inclined to the heir of the mighty Marius of whose Jugurthine campaign they had still a lively recollection.
48. Cf. IV. IX. Fresh Difficulties with Mithradates
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Reference address : https://www.ellopos.net/elpenor/rome/5-10-brundisium-pharsalus-thapsus.asp?pg=126