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
Caesar Proceeds to His Relief - The Insurrection Checked
At length a Celtic horseman from Cicero's camp succeeded in stealing through the enemy to Caesar. On receiving the startling news Caesar immediately set out, although only with two weak legions, together numbering about 7000, and 400 horsemen; nevertheless the announcement that Caesar was advancing sufficed to induce the insurgents to raise the siege. It was time; not one tenth of the men in Cicero's camp remained unwounded. Caesar, against whom the insurgent army had turned, deceived the enemy, in the way which he had already on several occasions successfully applied, as to his strength; under the most unfavourable circumstances they ventured an assault upon the Roman camp and in doing so suffered a defeat.
It is singular, but characteristic of the Celtic nation, that in consequence of this one lost battle, or perhaps rather in consequence of Caesar's appearance in person on the scene of conflict, the insurrection, which had commenced so victoriously and extended so widely, suddenly and pitiably broke off the war. The Nervii, Menapii, Aduatuci, Eburones, returned to their homes. The forces of the maritime cantons, who had made preparations for assailing the legion in Brittany, did the same.
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Reference address : https://www.ellopos.net/elpenor/rome/5-07-subjugation-west.asp?pg=102