At the end of Satya-yuga and the beginning of Tretā-yuga, a great fight took place between the demigods and the asuras. Unable to tolerate the effulgence of the demigods, the asuras fled the battle, leaving Vṛtrāsura, their commander in chief, to fight for himself. Vṛtrāsura, however, seeing the demons fleeing, instructed them in the importance of fighting and dying in the battlefield. One who is victorious in battle gains material possessions, and one who dies in the battlefield attains a residence at once in the celestial heavens. In either way, the fighter benefits.