The Histories · 1.103

When Phraortes had brought his life to an end, Kyaxares the son of Phraortes, the son of Deïokes, received the power. This king is said to have been yet much more warlike than his forefathers; and he first banded the men of Asia into separate divisions, that is to say, he first arrayed apart from one another the spearmen and the archers and the horsemen, for before that time they were all mingled together without distinction. This was he who fought with the Lydians when the day became night as they fought, and who also united under his rule the whole of Asia above the river Halys. And having gathered together all his subjects he marched upon Nineveh to avenge his father, and also because he desired to conquer that city. And when he had fought a battle with the Assyrians and had defeated them, while he was sitting down before Nineveh there came upon him a great army of Scythians, and the…

Herodotus of Halicarnassus · trans. G. C. Macaulay, 1890
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