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's Retreat from Dyrrachium to Thessaly
Pompeius might choose among these plans; no choice was left to Caesar. After that unfortunate engagement he entered on his retreat to Apollonia. Pompeius followed. The march from Dyrrhachium to Apollonia along a difficult road crossed by several rivers was no easy task for a defeated army pursued by the enemy; but the dexterous leadership of their general and the indestructible marching energy of the soldiers compelled Pompeius after four days' pursuit to suspend it as useless. He had now to decide between the Italian expedition and the march into the interior. However advisable and attractive the former might seem, and though various voices were raised in its favour, he preferred not to abandon the corps of Scipio, the more especially as he hoped by this march to get the corps of Calvinus into his hands.
Calvinus lay at the moment on the Egnatian road at Heraclea Lyncestis, between Pompeius and Scipio, and, after Caesar had retreated to Apollonia, farther distant from the latter than from the great army of Pompeius; without knowledge, moreover, of the events at Dyrrhachium and of his hazardous position, since after the successes achieved at Dyrrhachium the whole country inclined to Pompeius and the messengers of Caesar were everywhere seized. It was not till the enemy's main force had approached within a few hours of him that Calvinus learned from the accounts of the enemy's advanced posts themselves the state of things.
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Reference address : https://www.ellopos.net/elpenor/rome/5-10-brundisium-pharsalus-thapsus.asp?pg=79