Hindu mythological wars are the wars described in the Hindu texts of ancient India. These wars depicted both mortals of great prowess as well as deities and supernatural beings, often wielding supernatural weapons of great power. Hindu teachings prescribe war as the final option, to be employed only after all peaceful methods are exhausted. Participation in righteous war, or dharmayuddha, was said to be honourable and was a principal duty of the Kshatriya or the warrior varna, and victory in such wars was regarded as a matter of honour. The central battle in the Vedas is between Indra and Vritra, and the defeat of the demon Vritra leads to the liberation of rivers, cattle and Ushas (dawn/light). Kshatriya War Sacrifices: Ashvamedha: The famous horse-Yagya was conducted by allowing a horse to roam freely for a slated period of time, with the king performing the sacrifice laying claim to all the lands it touched. The king whose authority is contested must prove himself in battle or accept the imperial supremacy of the challenging king. When the horse returns safely after the period of time, the main sacrifice is performed, and the king, if successful in obtaining dominance over other kings, is crowned Emperor of the World. The Ashwamedha allows the opportunity to maintain peace if the kings do not choose to capturw the sacrificial horse. Rajasuya: Considered the ultimate Yagya, the king performing the sacrifice must openly challenge every king in the world to accept his supremacy or defeat him in battle. If and when the king returns successfully, having beaten all other known rulers, the performance of the sacrifice will send him to the abode of Indra. Vishvajit Yagna: a sacrifice performed by Brahmins after a king had won a war. The perennial battle between the devas and asuras is undertaken over the dominion of the three worlds: Svarga, Bhumi, and Patala, (Heaven, Earth, and the underworld). Both races are technically equal, possessors of great religious and martial powers, but the devas are committed to the worship of the Supreme Being and the practice of virtue.