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

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About the same time Domitius arrived in Macedonia; and while deputies were attending him from all parts, news came that Scipio approached with his legions, which spread a great alarm through the country; as fame, for the most part, magnifies the first appearances of things. Scipio, without stopping any where in Macedonia, advanced by great marches towards Domitius; but being come within twenty miles of him, suddenly changed his route, and turned off to Thessaly, in quest of Cassius Longinus. This was done so expeditiously, that he was actually arrived with his troops, when Cassius received the first notice of his march: for to make the more despatch, he had left M. Favonius at the river Haliacmon, which separates Macedonia from Thessaly, with eight cohorts, to guard the baggage of the legions, and ordered him to erect a fort there. At the same time, king Cotus's cavalry, which had been accustomed to make inroads into Thessaly, came pouring upon Cassius's camp; who, knowing that Scipio was upon his march, and believing the cavalry to be his, retired in a fright to the mountains that begirt Thessaly, and thence directed his course towards Ambracia. Scipio preparing to follow him, received letters from M. Favonius, that Domitius was coming up with his legions, nor would it be possible for him to maintain the post he was in, without his assistance. Scipio, upon his intelligence, changed his resolution, gave over the pursuit of Cassius, and advanced to the relief of Favonius. As he marched day and night without intermission, he arrived so opportunely, that the dust of Domitius's army, and his advanced parties, were descried at the same time. Thus Domitius's care preserved Cassius, and Scipio's diligence Favonius.