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
Vacillation of the Government - Rome Capitulates
After the arrival of Metellus and the decease of Strabo the army of the government was again at least a match for its antagonists, and was able to array itself for battle against the insurgents at the Alban Mount. But the minds of the soldiers of the government were deeply agitated; when Cinna appeared in front of them, they received him with acclamation as if he were still their general and consul; Metellus deemed it advisable not to allow the battle to come on, but to lead back the troops to their camp. The Optimates themselves wavered, and fell at variance with each other.
While one party, with the honourable but stubborn and shortsighted consul Octavius at their head, perseveringly opposed all concession, Metellus more experienced in war and more judicious attempted to bring about a compromise; but his conference with Cinna excited the wrath of the extreme men on both sides: Cinna was called by Marius a weakling, Metellus was called by Octavius a traitor. The soldiers, unsettled otherwise and not without cause distrusting the leadership of the untried Octavius, suggested to Metellus that he should assume the chief command, and, when he refused, began in crowds to throw away their arms or even to desert to the enemy.
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Reference address : https://www.ellopos.net/elpenor/rome/4-09-cinna-sulla.asp?pg=14