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
Perhaps too, if the cantonal constitution in Gaul afterwards appears more closely approximated to the Italian urban constitution, and the chief places of the canton as well as the common councils attain a more marked prominence in it than was probably the case in the original Celtic organization, the change may be referred to Caesar. No one probably felt more than the political heir of Gaius Gracchus and of Marius, how desirable in a military as well as in a political point of view it would have been to establish a series of Transalpine colonies as bases of support for the new rule and starting-points of the new civilization.
If nevertheless he confined himself to the settlement of his Celtic or German horsemen in Noviodunum(53) and to that of the Boii in the canton of the Haedui (54)--which latter settlement already rendered quite the services of a Roman colony in the war with Vercingetorix(55)-- the reason was merely that his farther plans did not permit him to put the plough instead of the sword into the hands of his legions.
53. Cf. V. VII. Caesar and Ariovistus
54. Cf. V. VII. The Helvetii Sent Back to Their Original Abodes
55. Cf. V. VII. Beginning of the Struggle
What he did in later years for the old Roman province in this respect, will be explained in its own place; it is probable that the want of time alone prevented him from extending the same system to the regions which he had recently subdued.
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Reference address : https://www.ellopos.net/elpenor/rome/5-07-subjugation-west.asp?pg=138