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Indrajit defeated Indra
During the battle between the Devas and Ravana, Lord Indra, king of heavens accompanied by all other devas captured Ravana. To rescue his father, Meghanada attacked Indra and his elephant Airavata and defeated all the Devas, even Indra. Meghanada tied and mounted Indra onto his celestial chariot and brought him to Ravana in Lanka. Ravana and Meghanada decided to kill Indra. Now Lord Brahma intervened and asked Meghanada to free Indra. Meghanada obliged and granted a chance to ask for a boon from Brahma. Meghanada asked for immortality, but Brahma remarked that absolute immortality is against the law of nature. Instead, he granted another boon that after the completion of the Yagna (fire-worship) of his native goddess Prathyangira or the "Nikumbhila Yagna" would complete, he would get a celestial chariot, mounting on which, any enemy could not kill him in war and become invulnerable.