Skanda Purana 7.20.264

7.20.264

pramathāsurasaṃgrāmadarśanārthaṃ vimānakoṭibhirupasthitānāṃ devānāṃ samājairnabhomaṇḍalasamācchādanam . pramathāsurasainyayo- ryuddhopakramaḥ, (gaṇayuddhārambhaḥ) .

The vault of heaven being covered by the assemblies of gods who arrived in tens of millions of aerial chariots to watch the battle between the pramathas and asuras. The commencement of the battle between the pramatha and asura armies; (the beginning of the battle of the gaṇas).