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
Italy against Caesar
As to Italy the great majority of the burgesses were, as has been already mentioned, averse to Caesar--more especially, of course, the whole aristocracy with their very considerable following, but also in a not much less degree the great capitalists, who could not hope in the event of a thorough reform of the commonwealth to preserve their partisan jury-courts and their monopoly of extortion. Of equally anti-democratic sentiments were the small capitalists, the landholders and generally all classes that had anything to lose; but in these ranks of life the cares of the next rent-term and of sowing and reaping outweighed, as a rule, every other consideration.
The Pompeian Army
The army at the disposal of Pompeius consisted chiefly of the Spanish troops, seven legions inured to war and in every respect trustworthy; to which fell to be added the divisions of troops-- weak indeed, and very much scattered--which were to be found in Syria, Asia, Macedonia, Africa, Sicily, and elsewhere. In Italy there were under arms at the outset only the two legions recently given off by Caesar, whose effective strength did not amount to more than 7000 men, and whose trustworthiness was more than doubtful, because--levied in Cisalpine Gaul and old comrades in arms of Caesar--they were in a high degree displeased at the unbecoming intrigue by which they had been made to change camps,(10) and recalled with longing their general who had magnanimously paid to them beforehand at their departure the presents which were promised to every soldier for the triumph.
10. Cf. V. IX. Counter-Arrangements of Caesar
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Reference address : https://www.ellopos.net/elpenor/rome/5-10-brundisium-pharsalus-thapsus.asp?pg=15