Res Gestae

When these preparations had been sufficiently made, just before dawn our men were drawn up in three divisions and tried an assault upon the walls,

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.)

Its first colour, so far as mortal eye can discern, is yellow, the second

It shows this combination of beautiful colours, as earthborn minds conceive, for the reason that its first part, corresponding in colour with the surrounding air, appears paler; the second is tawny, that is, somewhat more vivid than yellow; the third is red, because it is exposed to the brightness of the sun, and in proportion to alternation in the air absorbs its brilliance most purely, being just opposite;[*](I.e. the air is so affected by contact with the first two bands that it becomes more receptive of the effect of the sun’s rays.) the fourth is violet, because receiving the brightness of the sun’s rays with a thick rain of spray glittering between, through which it rises, it shows an appearance more like fire; and that colour, the more it spreads, passes over into blue and green.

Others think that the form of the rainbow appears to earthly sight when the rays of the sun penetrate a thick and lofty cloud and fill it with clear light. Since this does not find an outlet, it forms itself into a mass and glows from the intense friction; and it takes the colours nearest to white from the sun higher up, but the greenish shades from resemblance to the cloud just above it. The same thing usually happens with the sea, where the waters that dash upon the shore are white, and those further out without any admixture are blue.

And since the rainbow is an indication of a change of weather (as I have said), from sunny skies bringing up masses of clouds, or on the contrary changing an overcast sky to one that is calm and

For these and similar reasons the emperor wavered between hope and fear, since the severity of winter was drawing near and attacks were to be looked for in that trackless region, while also he feared mutiny of the exasperated soldiers. Besides this, his anxious mind was tormented by the thought that when, so to speak, the door of a rich house was open before him, he was returning without success.

Therefore abandoning his fruitless attempt, he returned to Syria, purposing to winter in Antioch, having suffered severely and grievously; for the losses which the Persians had inflicted upon him were not slight but terrible and long to be lamented. For it had happened, as if some fateful constellation so controlled the several events, that when Constantius in person warred with the Persians, adverse fortune always attended him. Therefore he wished to conquer at least through his generals, which, as we recall, did sometimes happen.