Anabasis (1.8.5-1.8.9)

As for the barbarians, Paphlagonian horsemen to the number of a thousand took station beside Clearchus on the right wing, as did the Greek peltasts, on the left was Ariaeus, Cyrus’ lieutenant, with the rest of the barbarian army,

and in the centre Cyrus and his horsemen, about six hundred in number. These troopers were armed with breastplates and thigh-pieces and, all of them except Cyrus, with helmets—Cyrus, however, went into the battle with his head unprotected. [In fact, it is said of the Persians in general that they venture all the perils of war with their heads unprotected.]

And all their horses [with Cyrus] had frontlets and breast-pieces; and the men carried, besides their other weapons, Greek sabres.

There were horsemen in white cuirasses on the left wing of the enemy, under the command, it was reported, of Tissaphernes; next to them were troops with wicker shields and, farther on, hoplites with wooden shields which reached to their feet, these latter being Egyptians, people said; and then more horsemen and more bowmen. All these troops were marching in national divisions, each nation in a solid square.