Matsya Purana — Tārakāsura’s Austerity and Boon; Mobilization for War; Bṛhaspati’s Fourfold P...
प्रमत्तचण्डमातंगतुरंगरथसंकुलम् प्रतस्थे ऽमरयुद्धाय बहुपत्तिपताकि तत् //
pramattacaṇḍamātaṃgaturaṃgarathasaṃkulam pratasthe 'marayuddhāya bahupattipatāki tat //
That army set out for war against the Immortals, crowded with frenzied, fierce elephants, horses, and chariots, and marked by many infantry divisions and fluttering banners.
This verse does not discuss Pralaya; it depicts a military march—an army advancing toward a divine war (amara-yuddha).
It reflects the kshatriya/royal duty of organized defense and warfare: maintaining a disciplined force (elephants, horses, chariots, infantry) and mobilizing under standards for a righteous campaign when required.
No Vastu or ritual procedure is stated directly; the significance is martial—highlighting classical ‘chaturanga’ style forces and the emblematic use of banners (pataka) in campaigns.