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
Consequences of Caesar's Defeats
But, even as it was, these days were fraught with mischief. Not only had Caesar endured the most serious losses and forfeited at a blow his entrenchments, the result of four months of gigantic labour; he was by the recent engagements thrown back again exactly to the point from which he had set out. From the sea he was more completely driven than ever, since Pompeius' elder son Gnaeus had by a bold attack partly burnt, partly carried off, Caesar's few ships of war lying in the port of Oricum, and had soon afterwards also set fire to the transport fleet that was left behind in Lissus; all possibility of bringing up fresh reinforcements to Caesar by sea from Brundisium was thus lost.
The numerous Pompeian cavalry, now released from their confinement, poured themselves over the adjacent country and threatened to render the provisioning of Caesar's army, which had always been difficult, utterly impossible. Caesar's daring enterprise of carrying on offensive operations without ships against an enemy in command of the sea and resting on his fleet had totally failed.
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Reference address : https://www.ellopos.net/elpenor/rome/5-10-brundisium-pharsalus-thapsus.asp?pg=76