For hitherto, whenever the armies met, they would only charge up to a certain distance, and there take flying shots, and so keep up the skirmish until evening fell.

But now the Assyrians saw their own men borne down on them in rout, with Cyrus and his comrades at their heels in full career, while Astyages and his cavalry were already within bowshot.

It was more than they could face, and they turned and fled.
After them swept the Medes in full pursuit, and those they caught they mowed down, horse and man, and those that fell they slew.

There was no pause until they came up with the Assyrian foot.

[24] Here at last they drew rein in fear of some hidden ambuscade, and Astyages led his army off.