Matsya Purana 153.22

153.22

āpyāyayantastridaśān garjanta iva cāmbudāḥ.
himācalābhe mahati kāñcanāmburuhasraji .. 153.21

Hearing those words, Indra directed the Devas to array His army Viṣṇu put the eleven Rudras, comprising all the power and asceticism of the three regions, ahead of Him At that time, the eleven terrible Rudras with their throats yellow, by wearing wreaths of serpents, holding skulls, beautified with the crescent moon on their forehead and with tufts of hair on their head, looking ferocious with their tridents and wearing lionskins, with their tawny matted hair, those eleven, named, Kapalî, Piṅgala, Bhîma, Birûpâkṣa, Bilohita, Ajeśa, Śasana, Śâstâ, Śambhu, Chanda and Dhruva—began to kill the demons who were attacking Viṣṇu and emboldened the Devas by roaring like thundering clouds Indra also made his appearance riding on his big Airavata elephant, having four tusks and rut flowing all round him, looking like the lofty snowclad Himâlaya with golden bells tinkling, on his sides brisk châmaras flowing, and asssuming any form at will At that instant, Indra looked like the rising Sun on the Udayâchala Mountain—15 23