On Geryon's island, Herakles killed the two-headed dog Orthos and the servant Eurytion, who tried to help the dog. Herakles was driving the cattle to the Golden Cup when Geryon appeared, ready to fight. Herakles shot him down and sailed away with the cattle. Herakles had many adventures on his return to Greece. On the Greek coast, Hera sent gadflies to drive the herd of cattle far and wide. Herkales managed to round-up a few and these he presented to Eurystheus. He sacrificed them to Hera.