M. Tullius Cicero, Orations, The fourteen orations against Marcus Antonius (Philippics)
C. D. Yonge, Ed.

[13] He writes, that Antonius is at Apollonia with seven cohorts, and he is either by this time taken prisoner (may the gods grant it!) or, at all events, like a modest man, he does not come near Macedonia, lest he should seem to act in opposition to the resolution of the senate. A levy of troops has been held in Macedonia, by the great zeal and diligence of Quintus Hortensius; whose admirable courage, worthy both of himself and of his ancestors, you may clearly perceive from the letters of Brutus. The legion which Lucius Piso, the lieutenant of Antonius, commanded, has surrendered itself to Cicero, my own son. Of the cavalry, which was being led into Syria in two divisions, one division has left the quaestor who was commanding it, in Thessaly, and has joined Brutus; and Cnaeus Domitius, a young man of the greatest virtue and wisdom and firmness, has carried off the other from the Syrian lieutenant in Macedonia. But Publius Vatinius, who has before this been deservedly praised by us, and who is justly entitled to farther praise at the present time, has opened the gates of Dyrrachium to Brutus, and has given him up his army.