Helen eloped with Paris of Troy. Agamemnon conducted a 10-year war against Troy to get her back for his brother. Because of lack of wind, the warships could not sail to Troy. In order to please the gods so that they might make the winds start to blow, Agamemnon sacrificed his daughter Iphigenia. Hunting goddess Artemis replaced her at the very last moment with a deer on the altar, and took Iphigenia to Tauris (See Iphigenia en Tauris by Euripides). The gods having been satisfied by such a sacrifice, the winds started blowing and the warfaring fleet departed.