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
Nothing remained for the Germans who came up too late but to return, nothing for the Treverian canton but to submit; its government reverted to the head of the Roman party Cingetorix, the son-in-law of Indutiomarus. After these expeditions of Caesar against the Menapii and of Labienus against the Treveri the whole Roman army was again united in the territory of the latter.
With the view of rendering the Germans disinclined to come back, Caesar once more crossed the Rhine, in order if possible to strike an emphatic blow against the troublesome neighbours; but, as the Chatti, faithful to their tried tactics, assembled not on their western boundary, but far in the interior, apparently at the Harz mountains, for the defence of the land, he immediately turned back and contented himself with leaving behind a garrison at the passage of the Rhine.
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Reference address : https://www.ellopos.net/elpenor/rome/5-07-subjugation-west.asp?pg=105