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
Its Issue - Flight of Pompeius
The day was thus lost and many an able soldier had fallen, but the army was still substantially intact, and the situation of Pompeius was far less perilous than that of Caesar after the defeat of Dyrrhachium. But while Caesar in the vicissitudes of his destiny had learned that fortune loves to withdraw herself at certain moments even from her favourites in order to be once more won back through their perseverance, Pompeius knew fortune hitherto only as the constant goddess, and despaired of himself and of her when she withdrew from him; and, while in Caesar's grander nature despair only developed yet mightier energies, the inferior soul of Pompeius under similar pressure sank into the infinite abyss of despondency.
As once in the war with Sertorius he had been on the point of abandoning the office entrusted to him in presence of his superior opponent and of departing,(33) so now, when he saw the legions retire over the stream, he threw from him the fatal general's scarf, and rode off by the nearest route to the sea, to find means of embarking there.
33. Cf. V. I. Indefinite and Perilous Character of the Sertorian War
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Reference address : https://www.ellopos.net/elpenor/rome/5-10-brundisium-pharsalus-thapsus.asp?pg=86