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

[546] That therefore he might fly the faster, he gave orders to cast away what might hinder his army's march; so they killed the mules and other creatures, excepting those that carried their darts and machines, which they retained for their own use, and this principally because they were afraid lest the Jews should seize upon them. He then made his army march on as far as Bethoron. Now the Jews did not so much press upon them when they were in large open places; but when they were penned up in their descent through narrow passages, then did some of them get before, and hindered them from getting out of them; and others of them thrust the hinder-most down into the lower places; and the whole multitude extended themselves over against the neck of the passage, and covered the Roman army with their darts. In which circumstances, as the footmen knew not how to defend themselves, so the danger pressed the horsemen still more, for they were so pelted, that they could not march along the road in their ranks, and the ascents were so high, that the cavalry were not able to march against the enemy; the precipices also and valleys into which they frequently fell, and tumbled down, were such on each side of them, that there was neither place for their flight, nor any contrivance could be thought of for their defense; till the distress they were at last in was so great, that they betook themselves to lamentations, and to such mournful cries as men use in the utmost despair: the joyful acclamations of the Jews also, as they encouraged one another, echoed the sounds back again, these last composing a noise of those that at once rejoiced and were in a rage. Indeed, things were come to such a pass, that the Jews had almost taken Cestius's entire army prisoners, had not the night come on, when the Romans fled to Bethoron, and the Jews seized upon all the places round about them, and watched for their coming out [in the morning].