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
Caesar Pursues Pompeius to Egypt
While the remnant of the defeated party thus allowed themselves to be helplessly driven about by fate, and even those who had determined to continue the struggle knew not how or where to do so, Caesar, quickly as ever resolving and quickly acting, laid everything aside to pursue Pompeius--the only one of his opponents whom he respected as an officer, and the one whose personal capture would have probably paralyzed a half, and that perhaps the more dangerous half, of his opponents. With a few men he crossed the Hellespont--his single bark encountered in it a fleet of the enemy destined for the Black Sea, and took the whole crews, struck as with stupefaction by the news of the battle of Pharsalus, prisoners--and as soon as the most necessary preparations were made, hastened in pursuit of Pompeius to the east.
The latter had gone from the Pharsalian battlefield to Lesbos, whence he brought away his wife and his second son Sextus, and had sailed onward round Asia Minor to Cilicia and thence to Cyprus. He might have joined his partisans at Corcyra or Africa; but repugnance toward his aristocratic allies and the thought of the reception which awaited him there after the day of Pharsalus and above all after his disgraceful flight, appear to have induced him to take his own course and rather to resort to the protection of the Parthian king than to that of Cato. While he was employed in collecting money and slaves from the Roman revenue-farmers and merchants in Cyprus, and in arming a band of 2000 slaves, he received news that Antioch had declared for Caesar and that the route to the Parthians was no longer open. So he altered his plan and sailed to Egypt, where a number of his old soldiers served in the army and the situation and rich resources of the country allowed him time and opportunity to reorganize the war.
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Reference address : https://www.ellopos.net/elpenor/rome/5-10-brundisium-pharsalus-thapsus.asp?pg=96