abhavat prathame yuge

tatah-thereafter; suranam-of the demigods; asuraih-with the demons; ranah-a great battle; parama-darunah-very fearful; treta-mukhe-in the beginning of Treta-yuga; narmadayam-on the bank of the River Narmada; abhavat-took place; prathame-in the first; yuge-millennium.