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
The Rhine Boundary
The consequences of this one campaign were immense; they were felt for many centuries after. The Rhine had become the boundary of the Roman empire against the Germans. In Gaul, which was no longer able to govern itself, the Romans had hitherto ruled on the south coast, while lately the Germans had attempted to establish themselves farther up. The recent events had decided that Gaul was to succumb not merely in part but wholly to the Roman supremacy, and that the natural boundary presented by the mighty river was also to become the political boundary.
The senate in its better times had not rested, till the dominion of Rome had reached the natural bounds of Italy--the Alps and the Mediterranean--and its adjacent islands. The enlarged empire also needed a similar military rounding off; but the present government left the matter to accident, and sought at most to see, not that the frontiers were capable of defence, but that they should not need to be defended directly by itself. People felt that now another spirit and another arm began to guide the destinies of Rome.
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Reference address : https://www.ellopos.net/elpenor/rome/5-07-subjugation-west.asp?pg=73