When the army of the Akhaians was held up at Aulis for lack of winds, the seers foretold that it would be possible to sail only if they sacrificed Iphigeneia to Artemis. At the insistence of the Akhaians, Agamemnon handed her over to be put to the knife and she was dragged to the altar. But the leaders could not bear to look on and, to a man, they turned their eyes elsewhere.
Forthwith he leapt in his armour from his chariot to the ground, and brandishing his two sharp spears went everywhere throughout host, urging them to fight; and he roused the dread din of battle. So they rallied, and took their stand with their faces toward the Achaeans, and the Argives gave ground and ceased from slaying; and they deemed that one of the immortals had come down from starry heaven to bear aid to the Trojans, that they rallied thus. And Hector shouted aloud and called to the Trojans: “Ye Trojans, high of heart, and far-famed allies, be men, my friends, and bethink you of furious valour, the while I go to Ilios and bid the elders that give counsel, and our wives to make prayer to the gods, and promise them hecatombs.”
The oracle of Ammon prophesied an end to the trouble if Kassiopeia’s daughter Andromeda were served up to the Ketos as a meal, so Kepheus, pushed to it by the Aithiopians, tied his daughter out on a rock. When Perseus saw her it was love at first sight, and he promised to kill the ketos and rescue the girl in return for her hand. Oaths were sworn, after which Perseus faced and slew the ketos, and set Andromeda free.