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
Sulla's Landing - Greece Occupied
But he came not, as Roman commanders-in-chief had been wont to make their appearance in the East. That his army of five legions or of at most 30,000 men,(14) was little stronger than an ordinary consular army, was the least element of difference.
14. We must recollect that after the outbreak of the Social War the legion had at least not more than half the number of men which it had previously, as it was no longer accompanied by Italian contingents.
Formerly in the eastern wars a Roman fleet had never been wanting, and had in fact without exception commanded the sea; Sulla, sent to reconquer two continents and the islands of the Aegean sea, arrived without a single vessel of war. Formerly the general had brought with him a full chest and drawn the greatest portion of his supplies by sea from home; Sulla came with empty hands--for the sums raised with difficulty for the campaign of 666 were expended in Italy--and found himself exclusively left dependent on requisitions.
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Reference address : https://www.ellopos.net/elpenor/rome/4-08-east-king-mithradates.asp?pg=49