13. The days and nights being alike spent in watching, made each side the more careful; and the Persians, being alarmed at the vast height to which the mounds were now carried, and at the enormous ram, which was accompanied by others of smaller size, made great exertions to burn them, and kept continually shooting firebrands and incendiary missiles at them; but their labour was vain, because the chief part of them was covered with wet skins and cloths, and some parts also had been steeped in alum, so that the fire might fall harmless upon them. 14. But the Romans, driving these rams on with great courage, although they had difficulty in defending themselves, disregarded danger, however imminent, in the hope of making themselves masters of the town. 15. And on the other hand, when the enormous ram was brought against the tower to which it was applied, as if it could at once throw it down, the garrison, by a clever contrivance, entangled its projecting iron head, which in shape was like that of a ram, with long cords on both sides, to prevent its being drawn back and then driven forward with great force, and to hinder it from making any serious impression on the walls by repeated blows; and meanwhile they poured on it burning pitch, and for a long time these engines were fixed at the point to which they had been advanced, and exposed to all the stones and javelins which were hurled from the walls. 16. By this time the mounds were raised to a considerable height, and the garrison, thinking that unless they used extraordinary vigilance their destruction must be at hand, resorted to extreme audacity; and making an unexpected sally from the gates, they attacked our front rank, and with all their might hurled firebrands and iron braziers loaded with fire against the rams. 17. But after a fierce but undecided conflict, the bulk of them were driven within the walls, without having succeeded in their attempt; and presently the battlements were attacked from the mounds which the Romans had raised, with arrows and slings and lighted javelins, which flew over the roofs of the towers, but did no harm, means having been prepared to extinguish any flames. 18. And as the ranks on both sides became thinner, and the Persians were now reduced to extremities unless some aid could be found, they prepared with redoubled energy a fresh sally from the camp: accordingly, they made a sudden sally, supported by increased numbers, and among the armed men were many bearing torches, and iron baskets full of fire, and faggots; and all kinds of things best adapted for setting fire to the works of the besiegers were hurled against them.