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
His Last Preparations against Rome
Mithradates, however, had no thought of delivering himself into the hands of the enemy, but was projecting new and still more extravagant plans. Straining all the resources with which the treasures that he had saved and the remnant of his states supplied him, he equipped a new army of 36,000 men consisting partly of slaves which he armed and exercised after the Roman fashion, and a war-fleet; according to rumour he designed to march westward through Thrace, Macedonia, and Pannonia, to carry along with him the Scythians in the Sarmatian steppes and the Celts on the Danube as allies, and with this avalanche of peoples to throw himself on Italy.
This has been deemed a grand idea, and the plan of war of the Pontic king has been compared with the military march of Hannibal; but the same project, which in a gifted man is a stroke of genius, becomes folly in one who is wrong-headed. This intended invasion of Italy by the Orientals was simply ridiculous, and nothing but a product of the impotent imagination of despair. Through the prudent coolness of their leader the Romans were prevented from Quixotically pursuing their Quixotic antagonist and warding off in the distant Crimea an attack, which, if it were not nipped of itself in the bud, would still have been soon enough met at the foot of the Alps.
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Reference address : http://www.ellopos.net/elpenor/rome/5-04-pompeius-east.asp?pg=25