aṣṭā-daśama - the eighteenth; saṅgrāme - battle; āgāmini - being about to happen; tat-antarā - at that instant; nārada - by the sage Nārada; preṣitaḥ - sent; vīraḥ - a fighter; yavanaḥ - a barbarian (named Kālayavana); pratyadṛśyata - appeared.

Just as the eighteenth battle was about to take place, a barbarian warrior named Kālayavana, sent by Nārada, appeared on the battlefield.