Devibhagavatapurana 4.10.16

4.10.16

śabdoccāraṇamātreṇa pātito vajrapāṇinā |
ahaṅkāramṛte yuddhaṃ na bhavatyeva niścayaḥ ||

No sooner Yayâti, said the king:-- did As'vamedha sacrifice, etc., with Ahamkâra, egoism, he was dropped by Indra with thunderbolt in his hands. So one can see that, without Ahamkâra no fight can occur. The ascetics had no bodily strength; therefore if they had to fight, it is through the waste of their Tapasyâ that they could do so.