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
On the other hand there is no evidence at all that Caesar contemplated like Alexander a career of victory extending indefinitely far; it is said indeed that he had intended to march from Parthia to the Caspian and from this to the Black Sea and then along its northern shores to the Danube, to annex to the empire all Scythia and Germany as far as the Northern Ocean--which according to the notions of that time was not so very distant from the Mediterranean--and to return home through Gaul; but no authority at all deserving of credit vouches for the existence of these fabulous projects.
In the case of a state which, like the Roman state of Caesar, already included a mass of barbaric elements difficult to be controlled, and had still for centuries to come more than enough to do with their assimilation, such conquests, even granting their military practicability, would have been nothing but blunders far more brilliant and far worse than the Indian expedition of Alexander. Judging both from Caesar's conduct in Britain and Germany and from the conduct of those who became the heirs of his political ideas, it is in a high degree probable that Caesar with Scipio Aemilianus called on the gods not to increase the empire, but to preserve it, and that his schemes of conquest restricted themselves to a settlement of the frontier--measured, it is true, by his own great scale--which should secure the line of the Euphrates, and, instead of the fluctuating and militarily useless boundary of the empire on the north-east, should establish and render defensible the line of the Danube.
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Reference address : https://www.ellopos.net/elpenor/rome/5-11-old-republic-new-monarchy.asp?pg=70