One of the most difficult of Hercules's labors was to procure the golden apples that the Hesperides, daughters of Hesperus, god of the west, guarded very jealously. At the foot of the tree coiled a fierce dragon whose nostrils poured out fire, and whose deadly breath would have slain any venturesome robber, even if he had escaped the dragon's claws. As Hercules did not know in what part of the great glowing west the Garden of the Hesperides lay, he wandered many miles before he met with any one who could direct him where to go. The first help he received was from the nymphs of the Eridanus River, who were sporting on the river bank and called to Hercules to come and join in their games. Much as he would have liked to rest, the hero dared not tarry; but he begged the friendly nymphs to tell him the way to the Garden of the Hesperides. They could not help him, but they advised him to go to old Proteus, "the Ancient of the Deep," who could tell him whatever he wished to know better than any one else. So Hercules went down to the seashore, and found the hoary god asleep in his cool green cave. Knowing the old man's wiles, the hero grasped him firmly and held him fast through all the bewildering changes by which he sought to frighten away the stranger. At last, finding himself securely caught, the Wizard assumed his own form, and asked Hercules what it was that he wished to know. The hero stated his errand, and Proteus told him, "in words that ne'er deceive," that he must find the giant Atlas who alone knew where the Garden of the Hesperides lay. Hercules then started again on his search, and in the course of his journey came to the Caucasus Mountains, where he found Prometheus, the stealer of the sacred fire, bound with adamantine chains to the rock, while a vulture daily feasted on his liver.[78] Hercules killed the foul bird, broke the chains, and set Prometheus free; and in return for his deliverance the grateful Titan directed his rescuer where to find the giant Atlas. Following Prometheus's advice, Hercules traveled straightway to Africa; and on the way he passed through the land of the Pygmies, a tiny race of warriors who waged continual warfare with neighboring tribes, and especially with their deadly enemies, the cranes. Hercules was not aware that he had reached the country of the Pygmies;[79] but one day, when he had fallen asleep from weariness, he was wakened by sharp prickings over his body; and looking around he saw a host of diminutive men, attacking him with their tiny weapons. The hero laughed at these brave efforts, caught up a few of the doughty little warriors, and, wrapping them in his lion skin, carried them back with him to the court of Eurystheus.