pratyaṣedhat prajāgaraḥ

te-all of them; canda-vega-of Candavega; anucarah-followers; puranjana-of King Puranjana; puram-city; yada-when; hartum-to plunder; arebhire-began; tatra-there; pratyasedhat-defended; prajagarah-the big serpent.