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 attempted first of all to close the mouth of the harbour by moles and floating bridges, with a view to exclude the returning fleet; but Pompeius caused the trading vessels lying in the harbour to be armed, and managed to prevent the complete closing of the harbour until the fleet appeared and the troops--whom Pompeius with great dexterity, in spite of the vigilance of the besiegers and the hostile feeling of the inhabitants, withdrew from the town to the last man unharmed--were carried off beyond Caesar's reach to Greece (17 March). The further pursuit, like the siege itself, failed for want of a fleet.
In a campaign of two months, without a single serious engagement, Caesar had so broken up an army of ten legions, that less than the half of it had with great difficulty escaped in a confused flight across the sea, and the whole Italian peninsula, including the capital with the state-chest and all the stores accumulated there, had fallen into the power of the victor. Not without reason did the beaten party bewail the terrible rapidity, sagacity, and energy of the "monster."
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Reference address : https://www.ellopos.net/elpenor/rome/5-10-brundisium-pharsalus-thapsus.asp?pg=26