Vritra broke Indra's two jaws during the battle, but was then thrown down by Indra and, in falling, crushed the fortresses that had already been shattered. For this feat, Indra became known as "Vṛtrahan" (lit. "Slayer of Vritra" and also as "slayer of the first-born of dragons"). Vritra's mother, Danu, who was also the mother of the Dānava race of Asuras, was then attacked and defeated by Indra with his thunderbolt. In one of the versions of the story, three Devas – Varuna, Soma and Agni – were coaxed by Indra into aiding him in the fight against Vritra, whereas before they had been on the side of Vritra (whom they called "Father").