Each one of the heroes whose history and adventures he gives, possessed a well-marked and striking character, and differed in temperament and action from the rest. Achilles was one. He was fiery, impetuous, and implacable in character, fierce and merciless; and, though perfectly undaunted and fearless, entirely destitute of magnanimity. There was a river called the Styx, the waters of which were said to have the property of making any one invulnerable. The mother of Achilles dipped him into it in his infancy, holding him by the heel. The heel, not having been immersed, was the only part which could be wounded. Thus he was safe in battle, and was a terrible warrior. He, however, quarreled with his comrades and withdrew from their cause on slight pretexts, and then became reconciled again, influenced by equally frivolous reasons.