Cyropaedia (1.2.10-1.2.14)

They provide for such hunting out of the public treasury; and as the king is their leader in war, so he not only takes part in the hunt himself but sees to it that the others hunt, too. The state bears the expense of the hunting for the[*] reason that the training it gives seems to be the best preparation for war itself. For it accustoms them to rise early in the morning and to endure both heat and cold, and it gives them practice in taking long tramps and runs, and they have to shoot or spear a wild beast whenever it comes in their way. And they must often whet their courage when one of the fierce beasts shows fight; for, of course, they must strike down the animal that comes to close quarters with them, and they must be on their guard against the one that threatens to attack them. In a word, it is not easy to find any quality required in war that is not required also in the chase.

And these, in turn, for twenty-five years[*] after the time they are there enrolled, are occupied as follows. In the first place, like the youths, they are at the disposal of the authorities, if they are needed in the interest of the commonwealth in any service that requires men who have already attained discretion and are still strong in body. But if it is necessary to make a military expedition anywhere, those who have been thus educated take the field, no longer with bow and arrows, nor yet with spears, but with what are termed weapons for close conflict—a corselet about their breast, a round shield upon their left arm (such as Persians are represented with in art), and in their right hands a sabre or bill. From this division also all the magistrates are selected, except the teachers of the boys.