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
Pompeius in Relation to the Gallic Victories of Caesar
Little as Pompeius liked and understood taking the initiative, he was yet on this occasion compelled by the change of his position towards both Clodius and Caesar to depart from his previous inaction. The irksome and disgraceful situation to which Clodius had reduced him, could not but at length arouse even his sluggish nature to hatred and anger. But far more important was the change which took place in his relation to Caesar. While, of the two confederate regents, Pompeius had utterly failed in the functions which he had undertaken, Caesar had the skill to turn his official position to an account which left all calculations and all fears far behind.
Without much inquiry as to permission, Caesar had doubled his army by levies in his southern province inhabited in great measure by Roman burgesses; had with this army crossed the Alps instead of keeping watch over Rome from Northern Italy; had crushed in the bud a new Cimbrian invasion, and within two years (696, 697) had carried the Roman arms to the Rhine and the Channel. In presence of such facts even the aristocratic tactics of ignoring and disparaging were baffled. He who had often been scoffed at as effeminate was now the idol of the army, the celebrated victory- crowned hero, whose fresh laurels outshone the faded laurels of Pompeius, and to whom even the senate as early as 697 accorded the demonstrations of honour usual after successful campaigns in richer measure than had ever fallen to the share of Pompeius.
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Reference address : https://www.ellopos.net/elpenor/rome/5-08-pompeius-caesar.asp?pg=11