 Their value against any opponent or commander of notable skill was very low as was already proven by the Ten Thousand (the Greek mercenaries with whom Xenophon served) at Cunaxa and Alexander in Arbela.Their use is considered more harmful than beneficial in the Greek tactical manuals, yet they could have a frightening effect on badly trained, inexperienced opponents, such as Asiatic tribal armies.The idea that the Romans had no previous experience in fighting chariots might be the reason why Antiochus III used them against the Roman army, with disastrous results for his own army.