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
This success, such as the insurgents themselves had hardly ventured to hope for, increased the ferment among the Celtic patriots so greatly that the Romans were no longer sure of a single district with the exception of the Haedui and Remi, and the insurrection broke out at the most diverse points. First of all the Eburones followed up their victory. Reinforced by the levy of the Aduatuci, who gladly embraced the opportunity of requiting the injury done to them by Caesar, and of the powerful and still unsubdued Menapii, they appeared in the territory of the Nervii, who immediately joined them, and the whole host thus swelled to 60,000 moved forward to confront the Roman camp formed in the Nervian canton.
Quintus Cicero, who commanded there, had with his weak corps a difficult position, especially as the besiegers, learning from the foe, constructed ramparts and trenches, -testudines- and moveable towers after the Roman fashion, and showered fire-balls and burning spears over the straw-covered huts of the camp. The only hope of the besieged rested on Caesar, who lay not so very far off with three legions in his winter encampment in the region of Amiens. But--a significant proof of the feeling that prevailed in Gaul- for a considerable time not the slightest hint reached the general either of the disaster of Sabinus or of the perilous situation of Cicero.
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Reference address : https://www.ellopos.net/elpenor/rome/5-07-subjugation-west.asp?pg=101