Flavius Josephus, Antiquities of the Jews
William Whiston, A.M., Ed.

[305] And this was the speech which Judas made to encourage them. But when the enemy sent Gorgias, with five thousand foot and one thousand horse, that he might fall upon Judas by night, and had for that purpose certain of the runagate Jews as guides, the son of Mattathias perceived it, and resolved to fall upon those enemies that were in their camp, now their forces were divided. When they had therefore supped in good time, and had left many fires in their camp, he marched all night to those enemies that were at Emmaus. So that when Gorgias found no enemy in their camp, but suspected that they were retired, and had hidden themselves among the mountains, he resolved to go and seek them wheresoever they were. But about break of day Judas appeared to those enemies that were at Emmaus, with only three thousand men, and those ill armed, by reason of their poverty; and when he saw the enemy very well and skillfully fortified in their camp, he encouraged the Jews, and told them that they ought to fight, though it were with their naked bodies, for that God had sometimes of old given such men strength, and that against such as were more in number, and were armed also, out of regard to their great courage. So he commanded the trumpeters to sound for the battle; and by thus falling upon the enemies when they did not expect it, and thereby astonishing and disturbing their minds, he slew many of those that resisted him, and went on pursuing the rest as far as Gadara, and the plains of Idumea, and Ashdod, and Jamnia; and of these there fell about three thousand. Yet did Judas exhort his soldiers not to be too desirous of the spoils, for that still they must have a contest and battle with Gorgias, and the forces that were with him; but that when they had once overcome them, then they might securely plunder the camp, because they were the only enemies remaining, and they expected no others. And just as he was speaking to his soldiers, Gorgias's men looked down into that army which they left in their camp, and saw that it was overthrown, and the camp burnt; for the smoke that arose from it showed them, even when they were a great way off, what had happened. When therefore those that were with Gorgias understood that things were in this posture, and perceived that those that were with Judas were ready to fight them, they also were affrighted, and put to flight; but then Judas, as though he had already beaten Gorgias's soldiers without fighting, returned and seized on the spoils. He took a great quantity of gold, and silver, and purple, and blue, and then returned home with joy, and singing hymns to God for their good success; for this victory greatly contributed to the recovery of their liberty.