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.
19.12
This was the size of the army, and such was the intention of Brennus, when he attacked Greece. The spirit of the Greeks was utterly broken, but the extremity of their terror forced them to defend Greece. They realized that the struggle that faced them would not be one for liberty, as it was when they fought the Persian, and that giving water and earth would not bring them safety. They still remembered the fate of Macedonia, Thrace and Paeonia during the former incursion of the Gauls, and reports were coming in of enormities committed at that very time on the Thessalians. So every man, as well as every state, was convinced that they must either conquer or perish.