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
Combats with the Marsians - Defeat and Death of Lupus
At the same time operations had also begun in Central Italy, where the revolt of the Abruzzi and the region of the Fucine lake threatened the capital in dangerous proximity. An independent corps under Gnaeus Pompeius Strabo was sent into Picenum in order that, resting for support on Firmum and Falerio, it might threaten Asculum; but the main body of the Roman northern army took its position under the consul Lupus on the borders of the Latin and Marsian territories, where the Valerian and Salarian highways brought the enemy nearest to the capital; the rivulet Tolenus (Turano), which crosses the Valerian road between Tibur and Alba and falls into the Velino at Rieti, separated the two armies.
The consul Lupus impatiently pressed for a decision, and did not listen to the disagreeable advice of Marius that he should exercise his men--unaccustomed to service--in the first instance in petty warfare. At the very outset the division of Gaius Perpenna, 10,000 strong, was totally defeated. The commander-in- chief deposed the defeated general from his command and united the remnant of the corps with that which was under the orders of Marius, but did not allow himself to be deterred from assuming the offensive and crossing the Tolenus in two divisions, led partly by himself, partly by Marius, on two bridges constructed not far from each other.
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Reference address : https://www.ellopos.net/elpenor/rome/4-07-sulpician-revolution.asp?pg=31