Res Gestae

The Persians, however, were more sorely troubled by the various missiles sent from the ballistae, which as if along a tight rope[*](Transenna has various meanings, one of which is extentus funis (Serv. on Aen. v. 488). Per transennam in this sense occurs only here. In xxv. 6, 14 Ammianus by e transenna emissi, refers probably to runners starting in a race when the rope is dropped, and meaning all together. Some take per transennam in the same sense, but it seems to refer rather to the accuracy of the marksmen, as if their missiles slid down a rope stretched from their ballistae to the mark at which they aimed.) rushed down the artificial slopes of the earthworks. Therefore, thinking that their fortunes were now at their lowest ebb, they rushed to meet certain death, and distributing the duties of their soldiers in the midst of their desperate crisis, they left some behind to hold the walls, while a strong force secretly opened a postern gate and rushed out, drawn sword in hand, followed by others who carried concealed fires.

And while the Romans now pressed hard on those who gave way, and now met those who ventured to charge, the men who carried the fire-pans, stooping low and creeping along, pushed live coals into the joints of one of the mounds, which was built of the boughs of various kinds of trees, of rushes, and of bundles of cane. These, as soon as the dry fuel caught fire, at once

But when the coming of evening put an end to the fighting, and both sides withdrew for a brief rest, the emperor, divided between various plans and pondering them—since pressing reasons urged a longer attempt to destroy Phaenicha, a fortress opposed as an almost unsurmountable barrier to the enemy’s inroads; but the lateness of the season dissuaded him—finally decided to stay there, and to carry on light skirmishes, thinking that perhaps the Persians would yield through lack of supplies. But the result was not what he looked for.

For when the fighting slackened, wet weather followed, dripping clouds with menacing darkness appeared, and the ground was so drenched with continual rains, that soft and sticky mud caused general trouble in that region of rich turf. And, besides all this, thunder and lightning with repeated crashes terrified the timorous minds of men.

More than this, rainbows were constantly seen; and how that phenomenon is wont to occur, a brief explanation will show. The warmer exhalations of the earth and its moist vapours are condensed into clouds; these are then dissipated into a fine spray, which, made brilliant by the sun’s rays that fall upon it, rises swiftly and, coming opposite the fiery orb itself, forms the rainbow. And the bow is rounded into a great curve, because it extends over our world, which the science of natural philosophy tells us rests upon a hemisphere.[*](The meaning seems to be that the vault of the heavens is therefore a hemisphere.)