There yet lay beyond Egypt territories for Kambysês to conquer,—though Kyrênê and Barka, the Greek colonies near the coast of Libya, placed themselves at once out of the reach of danger by sending to him tribute and submission at Memphis. He projected three new enterprises: one against Carthage, by sea; the other two, by land, against the Ethiopians, far to the southward up the course of the Nile, and against the oracle and oasis of Zeus Ammon, amidst the deserts of Libya. Towards Ethiopia he himself conducted his troops, but was compelled to bring them back without reaching it, since they were on the point of perishing with famine; while the division which he sent against the temple of Ammon is said to have been overwhelmed by a sand-storm in the desert. The expedition against Carthage was given up, for a reason which well deserves to be commemorated. The Phenicians, who formed the most efficient part of his navy, refused to serve against their kinsmen and colonists, pleading the sanctity of mutual oaths as well as the ties both of relationship and traffic.[393] Even the frantic Kambysês was compelled to accept, and perhaps to respect, this honorable refusal, which was not imitated by the Ionic Greeks when Darius and Xerxês demanded the aid of their ships against Athens,—we must add, however, that they were then in a situation much more exposed and helpless than that in which the Phenicians stood before Kambysês. [393] Herodot. iii, 19. Among the sacred animals so numerous and so different throughout the various nomes of Egypt, the most venerated of all was the bull Apis. Yet such peculiar conditions were required by the Egyptian religion as to the birth, the age, and the marks of this animal, that, when he died, it was difficult to find a new calf properly qualified to succeed him. Much time was sometimes spent in the search, and when an unexceptionable successor was at last found, the demonstrations of joy in Memphis were extravagant and universal. At the moment when Kambysês returned to Memphis from his Ethiopian expedition, full of humiliation for the result, it so happened that a new Apis was just discovered; and as the population of the city gave vent to their usual festival pomp and delight, he construed it into an intentional insult towards his own recent misfortunes. In vain did the priests and magistrates explain to him the real cause of these popular manifestations; he persisted in his belief, punished some of them with death and others with stripes, and commanded every man seen in holiday attire to be slain. Furthermore,—to carry his outrage against Egyptian feeling to the uttermost pitch,—he sent for the newly-discovered Apis, and plunged his dagger into the side of the animal, who shortly afterwards died of the wound.[394] [394] Herodot. iii, 29.