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 Military Plans - Defence of the Frontier
But, however decidedly and urgently the circumstances pointed to military monarchy, and however distinctly Caesar took the supreme command exclusively for himself, he was nevertheless not at all inclined to establish his authority by means of, and on, the army. No doubt he deemed a standing army necessary for his state, but only because from its geographical position it required a comprehensive regulation of the frontiers and permanent frontier garrisons. Partly at earlier periods, partly during the recent civil war, he had worked at the tranquillizing of Spain, and had established strong positions for the defence of the frontier in Africa along the great desert, and in the north-west of the empire along the line of the Rhine.
He occupied himself with similar plans for the regions on the Euphrates and on the Danube. Above all he designed an expedition against the Parthians, to avenge the day of Carrhae; he had destined three years for this war, and was resolved to settle accounts with these dangerous enemies once for all and not less cautiously than thoroughly. In like manner he had projected the scheme of attacking Burebistas king of the Getae, who was greatly extending his power on both sides of the Danube,(37) and of protecting Italy in the north-east by border-districts similar to those which he had created for it in Gaul.
37. Cf. V. VII. The New Dacian Kingdom
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Reference address : https://www.ellopos.net/elpenor/rome/5-11-old-republic-new-monarchy.asp?pg=69