De Agricultura
Philo Judaeus
The works of Philo Judaeus, the contemporary of Josephus, volume 1. Yonge, C. D., translator. London: Henry G. Bohn, 1854.
There are some men, again, who, having armed and strongly fortified both their hands in a most hard and terrible manner, like iron, attack their adversaries, and batter their heads and faces, and the other parts of their bodies, and whenever they are able to plant a blow, they inflict great fractures, and then claim the decision in their favour, and the crown of victory, by means of their merciless cruelty.