Prahlāda Mahārāja said: When our father, Hiraṇyakaśipu, went to Mandarācala Mountain to execute severe austerities, in his absence the demigods, headed by King Indra, made a severe attempt to subdue all the demons in warfare.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
प्रह्लाद उवाच । पितरि प्रस्थितेऽस्माकं तपसे मन्दराचलम् । युद्धोद्यमं परं चक्रुर्विबुधा दानवान् प्रति
prahlāda uvāca | pitari prasthite'smākaṃ tapase mandarācalam | yuddhodyamaṃ paraṃ cakrurvibudhā dānavān prati
SB 7.7.2