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
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.
