Under the leadership of Vrtrasura, his followers, the Kalakeyas (कालकेय-s) and other rakshasas besieged the Devatas. The battle raged for a long time between [[Indra and Vrtrasura (इन्द्रः वृत्रासुरः च)|Indra and Vrtrasura]] but Vrtra was invincible. Devatas along with Indra approach Mahavishnu for a solution to kill Vrtrasura. Mahavishnu informs them that Vrtra can be killed only with the bone of [[Dadhichi (दधीचिः)|Dadhichi]] rishi. Thereby, from the bones of Dadhichi rishi, Indra prepares his weapon called "Vajra", and with a fatal stroke of Vajra, Vrtra falls dead. Hence, Indra gets the name Vrtraha (वृत्रहा). (Mahabharata. Vana Parva. Chap 101 <ref>Pt. Ramnarayan. Mahabharat ([https://archive.org/stream/Mahabharata04SanskritHindiPanditRamnarayanGitaPress/Mahabharata%2002_%20Sanskrit-Hindi_Pandit%20Ramnarayan_Gita%20Press#page/n341/mode/2up VanaParva, Adhyaya 101]) Page No 343. Gorakhpur: Gita Press</ref>. Shanti Parva. Chap 281. Verses 13 -21) | Under the leadership of Vrtrasura, his followers, the Kalakeyas (कालकेय-s) and other rakshasas besieged the Devatas. The battle raged for a long time between [[Indra and Vrtrasura (इन्द्रः वृत्रासुरः च)|Indra and Vrtrasura]] but Vrtra was invincible. Devatas along with Indra approach Mahavishnu for a solution to kill Vrtrasura. Mahavishnu informs them that Vrtra can be killed only with the bone of [[Dadhichi (दधीचिः)|Dadhichi]] rishi. Thereby, from the bones of Dadhichi rishi, Indra prepares his weapon called "Vajra", and with a fatal stroke of Vajra, Vrtra falls dead. Hence, Indra gets the name Vrtraha (वृत्रहा). (Mahabharata. Vana Parva. Chap 101 <ref>Pt. Ramnarayan. Mahabharat ([https://archive.org/stream/Mahabharata04SanskritHindiPanditRamnarayanGitaPress/Mahabharata%2002_%20Sanskrit-Hindi_Pandit%20Ramnarayan_Gita%20Press#page/n341/mode/2up VanaParva, Adhyaya 101]) Page No 343. Gorakhpur: Gita Press</ref>. Shanti Parva. Chap 281. Verses 13 -21) |