4. For the Parthiscus[86] waters this land, proceeding with oblique windings till it falls into the Danube. But while it flows unmixed, it passes through a vast extent of country, which, near its junction with the Danube, it narrows into a very small corner, so that over on the side of the Danube those who live in that district are protected from the attack of the Romans, and on the side of the Parthiscus they are secured from any irruptions of the barbarians. Since along its course the greater part of the ground is frequently under water from the floods, and always swampy and full of osiers, so as to be quite impassable to strangers; and besides the mainland there is an island close to the mouth of the river, which the stream itself seems to have separated into its present state. 5. Accordingly, at the desire of the emperor, they came with native arrogance to our bank of the river, not, as the result showed, with the intention of obeying his commands, but that they might not seem alarmed at the presence of his soldiers. And there they stood, stubbornly showing that they had come bent on resistance. 6. And as the emperor had foreseen that this might happen, he secretly divided his army into several squadrons, and by the rapidity of their movements hemmed in the barbarians between his own lines. And then, standing on a mound, with a few of his officers and a small body-guard, he gently admonished them not to give way to ferocity. 7. But they, wavering and in doubt, were agitated by various feelings, and mingling craft with their fury, they had recourse to arms and to prayers at the same time. And meditating to make a sudden attack on those of our men who were nearest, they threw their shields some distance before them, with the intent that while they made some steps forward to recover them, they might thus steal a little ground without giving any indication of their purpose. 8. And as it was now nearly evening, and the departing light warned us to avoid further delay, our soldiers raised their standards and fell upon them with a fiery onset. And they, in close order, directed all their force against the mound on which (as has been already said) the emperor himself was standing, fixing their eyes on him, and uttering fierce outcries against him. 9. Our army was indignant at such insane audacity, and forming into a triangle, to which military simplicity has given the name of "the boar's head," with a violent charge they scattered the barbarians now pressing vigorously upon the emperor; on the right our infantry slew their infantry, and on the left our cavalry dashed among their squadrons of light horsemen.