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 Events in the East, and Their Reaction on Rome
But while the factions of the capital were indulging in their wonted mutual quarrels, which they were never able to bring to any proper decision, events in the east followed their fatal course, as we have already described; and it was these events that brought the dilatory course of the politics of the capital to a crisis. The war both by land and by sea had there taken a most unfavourable turn. In the beginning of 687 the Pontic army of the Romans was destroyed, and their Armenian army was utterly breaking up on its retreat; all their conquests were lost, the sea was exclusively in the power of the pirates, and the price of grain in Italy was thereby so raised that they were afraid of an actual famine.
No doubt, as we saw, the faults of the generals, especially the utter incapacity of the admiral Marcus Antonius and the temerity of the otherwise able Lucius Lucullus, were in part the occasion of these calamities; no doubt also the democracy had by its revolutionary agitations materially contributed to the breaking up of the Armenian army. But of course the government was now held cumulatively responsible for all the mischief which itself and others had occasioned, and the indignant hungry multitude desired only an opportunity to settle accounts with the senate.
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Reference address : https://www.ellopos.net/elpenor/rome/5-03-fall-oligarchy-pompeius.asp?pg=22