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 Numidians, who were in great numbers in Caesar's army, began to pass over in troops to Mutilus or rather to Oxyntas, the son of Jugurtha, who on the surrender of Venusia had fallen into the hands of the Samnites and now appeared among their ranks in regal purple; so that Caesar found himself compelled to send home the whole African corps. Mutilus ventured even to attack the Roman camp; but he was repulsed, and the Samnites, who while retreating were assailed in the rear by the Roman cavalry, left nearly 6000 dead on the field of battle.
It was the first notable success which the Romans gained in this war; the army proclaimed the general -imperator-, and the sunken courage of the capital began to revive. It is true that not long afterwards the victorious army was attacked in crossing a river by Marius Egnatius, and so emphatically defeated that it had to retreat as far as Teanum and to be reorganized there; but the exertions of the active consul succeeded in restoring his army to a serviceable condition even before the arrival of winter, and he reoccupied his old position under the walls of Acerrae, which the Samnite main army under Mutilus continued to besiege.
Do you see any typos or other mistakes? Please let us know and correct them
Reference address : https://www.ellopos.net/elpenor/rome/4-07-sulpician-revolution.asp?pg=30