The Histories · 7.87

These nations alone served as cavalry, and the number of the cavalry proved to be eight myriads, apart from the camels and the chariots. Now the rest of the cavalry was arrayed in squadrons, but the Arabians were placed after them and last of all, for the horses could not endure the camels, and therefore they were placed last, in order that the horses might not be frightened.

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