The first and simplest was not to desist from assailing the vanquished army, and, if it departed, to pursue it.

Secondly, Pompeius might leave Caesar himself and his best troops in Greece, and might cross in person, as he had long been making preparations for doing, with the main army to Italy, where the feeling was decidedly antimonarchical and the forces of Caesar, after the despatch of the best troops and their brave and trustworthy commandant to the Greek army, would not be of very much moment.

Lastly, the victor might turn inland, effect a junction with the legions of Metellus Scipio, and attempt to capture the troops of Caesar stationed in the interior.
The latter forsooth had, immediately after the arrival of the second freight from Italy, on the one hand despatched strong detachments to Aetolia and Thessaly to procure means of subsistence for his army, and on the other had ordered a corps of two legions under Gnaeus Domitius Calvinus to advance on the Egnatian highway towards Macedonia, with the view of intercepting and if possible defeating in detail the corps of Scipio advancing on the same road from Thessalonica.
Calvinus and Scipio had already approached within a few miles of each other, when Scipio suddenly turned southward and, rapidly crossing the Haliacmon (Inje Karasu) and leaving his baggage there under Marcus Favonius, penetrated into Thessaly, in order to attack with superior force Caesar's legion of recruits employed in the reduction of the country under Lucius Cassius Longinus.
But Longinus retired over the mountains towards Ambracia to join the detachment under Gnaeus Calvisius Sabinus sent by Caesar to Aetolia, and Scipio could only cause him to be pursued by his Thracian cavalry, for Calvinus threatened his reserve left behind under Favonius on the Haliacmon with the same fate which he had himself destined for Longinus.

So Calvinus and Scipio met again on the Haliacmon, and encamped there for a considerable time opposite to each other.
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.