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
Indulgences towards Existing Arrangements
The former cantonal constitutions with their hereditary kings, or their presiding feudal-oligarchies, continued in the main to subsist after the conquest, and even the system of clientship, which made certain cantons dependent on others more powerful, was not abolished, although no doubt with the loss of political independence its edge was taken off. The sole object of Caesar was, while making use of the existing dynastic, feudalist, and hegemonic divisions, to arrange matters in the interest of Rome, and to bring everywhere into power the men favourably disposed to the foreign rule.
Caesar spared no pains to form a Roman party in Gaul; extensive rewards in money and specially in confiscated estates were bestowed on his adherents, and places in the common council and the first offices of state in their cantons were procured for them by Caesar's influence. Those cantons in which a sufficiently strong and trustworthy Roman party existed, such as those of the Remi, the Lingones, the Haedui, were favoured by the bestowal of a freer communal constitution--the right of alliance, as it was called--and by preferences in the regulation of the matter of hegemony.
The national worship and its priests seem to have been spared by Caesar from the outset as far as possible; no trace is found in his case of measures such as were adopted in later times by the Roman rulers against the Druidical system, and with this is probably connected the fact that his Gallic wars, so far as we see, do not at all bear the character of religious warfare after the fashion which formed so prominent a feature of the Britannic wars subsequently.
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Reference address : https://www.ellopos.net/elpenor/rome/5-07-subjugation-west.asp?pg=136