C. Julius Caesar, Commentaries on the Civil War
William Duncan, Ed.

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Caesar was under a necessity of going to Apollonia, to leave his wounded there, to pay his army, confirm his friends in their duty, and garrison the towns that had submitted. But he took no longer time to these affairs, than the importance of his other engagements would allow. For fearing that Pompey might surprise Domitius Calvinus, he put himself in full march to join him. The scheme he proceeded on was this: that if Pompey took the same route, he must leave the sea, the forces he had at Dyrrhachium, with all his ammunition and provision; which would bring them upon equal terms: if he passed into Italy, Caesar purposed to join Domitius, and march to its defence by the coast of Illyricum: in fine, should he fall upon Apollonia and Oricum, and endeavour to exclude him from the sea coast; in that case he reckoned to oblige him, by attacking Metellus Scipio, to leave every thing to succour him. Caesar therefore despatched couriers to Domitius, to acquaint him with his design; and leaving four cohorts at Apollonia, one at Lissus, and three at Oricum, with the sick and wounded, began his march through Epirus and Acarnania. Pompey, on his side, guessing Caesar's design, made what haste he could to join Scipio, that if Caesar should march that way, he might prevent his being overpowered; but should he still keep near Corcyra, and the sea, because of the legions and cavalry he expected from Italy; in that case, he purposed to fall upon Domitius with all his forces.