12. Along its front very sharp spears with three points are fastened, heavy with iron, like the thunderbolts represented by painters or sculptors, and strong enough with the projecting points to tear to pieces whatever it strikes.
13. A number of soldiers within guide this vast mast with wheels and ropes, urging with vehement impulse against the weaker parts of the wall, so that, unless repelled by the strength of the garrison above, it breaks down the wall and lays open a great breach.
14. The firebolts, which are a kind of missile, are made thus. They take an arrow of cane, joined together between the point and the reed with jagged iron, and made in the shape of a woman's spindle, with which linen threads are spun; this is cunningly hollowed out in the belly and made with several openings, and in the cavity fire and fuel of some kind is placed.
15. Then if it be shot slowly from a slack bow (for if it be shot with too much speed the fire is extinguished), so as to stick anywhere, it burns obstinately, and if sprinkled with water it creates a still fiercer fire, nor will anything but throwing dust upon it quench it. This is enough to say of mural engines; let us now return to our original subject.
V.
§ 1. Having received the reinforcements of the Saracens which they so cheerfully offered, the emperor advanced with speed, and at the beginning of April entered Circesium, a very secure fortress, and skilfully built, it is surrounded by the two rivers Aboras (or Chaboras) and Euphrates, which make it as it were an island.
2. It had formerly been small and insecure, till Diocletian surrounded it with lofty towers and walls when he was strengthening his inner frontier within the very territories of the barbarians, in order to prevent the Persians from overrunning Syria, as had happened a few years before to the great injury of the province.
3. For it happened one day at Antioch, when the city was in perfect tranquillity, a comic actor being on the stage with his wife, acting some common play, while the people were delighted with his acting, the wife suddenly exclaimed, "Unless I am dreaming, here are the Persians;" and immediately the populace turning round, were put to flight, and driven about in every direction while seeking to escape the darts which were showered upon them; and so the city being burnt and numbers of the citizens slain, who, as is usual in time of peace, were strolling about carelessly, and all the places in the neighbourhood being burnt and laid waste, the enemy loaded with booty returned in safety to their own country after having burnt Mareades alive, who had wickedly guided them to the destruction of his fellow-citizens. This event took place in the time of Gallienus.
4. But Julian, while remaining at Circesium to give time for his army and all its followers to cross the bridge of boats over the Aboras, received letters with bad news from Sallust, the prefect of Gaul, entreating him to suspend his expedition against the Parthians, and imploring him not in such an unseasonable manner to rush on irrevocable destruction before propitiating the gods.