Kitap 10
19.10
When the Gallic horsemen were engaged, the servants remained behind the ranks and proved useful in the following way. Should a horseman or his horse fall, the slave brought him a horse to mount; if the rider was killed, the slave mounted the horse in his master's place; if both rider and horse were killed, there was a mounted man ready. When a rider was wounded, one slave brought back to camp the wounded man, while the other took his vacant place in the ranks.
19.11
I believe that the Gauls in adopting these methods copied the Persian regiment of the Ten Thousand, who were called the Immortals. There was, however, this difference. The Persians used to wait until the battle was over before replacing casualties, while the Gauls kept reinforcing the horsemen to their full number during the height of the action. This organization is called in their native speech trimarcisia, for I would have you know that marca is the Celtic name for a horse.
