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 sagacious calculator had on this occasion miscalculated. The fire was smothered, but not extinguished. The stroke, under which the head of Acco fell, was felt by the whole Celtic nobility. At this very moment the position of affairs presented better prospects than ever. The insurrection of the last winter had evidently failed only through Caesar himself appearing on the scene of action; now he was at a distance, detained on the Po by the imminence of civil war, and the Gallic army, which was collected on the upper Seine, was far separated from its dreaded leader.
If a general insurrection now broke out in central Gaul, the Roman army might be surrounded, and the almost undefended old Roman province be overrun before Caesar reappeared beyond the Alps, even if the Italian complications did not altogether prevent him from further concerning himself about Gaul.
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Reference address : https://www.ellopos.net/elpenor/rome/5-07-subjugation-west.asp?pg=108