Matsya Purana — The Battle at Tripura: Shiva’s Strategy
इत्युक्तो वै भगवता रुद्रेणेह सुरेश्वरः ययौ तत्त्रिपुरं जेतुं तेन सैन्येन संवृतः //
ityukto vai bhagavatā rudreṇeha sureśvaraḥ yayau tattripuraṃ jetuṃ tena sainyena saṃvṛtaḥ //
Thus addressed here by the Blessed Lord Rudra, the Lord of the gods set out to conquer that Tripura, surrounded by that very army.
This verse does not describe Pralaya; it narrates a martial episode where Indra, prompted by Rudra, advances to conquer Tripura.
Indirectly, it reflects the kṣatriya ideal of acting on righteous counsel and mobilizing forces for the protection of cosmic order—here symbolized by the gods proceeding against a fortified threat.
The key term is “Tripura,” a famed triple-fortress/city motif in Purāṇic literature; while no Vāstu rule is stated, the verse situates the narrative around a fortified urban structure central to the Tripura-dahana tradition.