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
Field of Caesar's Power - Upper Italy
While Caesar thus had the one thing which was needful-- unlimited political and military authority and a trustworthy army ready for the fight--his power extended, comparatively speaking, over only a very limited space. It was based essentially on the province of Upper Italy. This region was not merely the most populous of all the districts of Italy, but also devoted to the cause of the democracy as its own.
The feeling which prevailed there is shown by the conduct of a division of recruits from Opitergium (Oderzo in the delegation of Treviso), which not long after the outbreak of the war in the Illyrian waters, surrounded on a wretched raft by the war-vessels of the enemy, allowed themselves to be shot at during the whole day down to sunset without surrendering, and, such of them as had escaped the missiles, put themselves to death with their own hands during the following night. It is easy to conceive what might be expected of such a population. As they had already granted to Caesar the means of more than doubling his original army, so after the outbreak of the civil war recruits presented themselves in great numbers for the ample levies that were immediately instituted.
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Reference address : https://www.ellopos.net/elpenor/rome/5-10-brundisium-pharsalus-thapsus.asp?pg=9