Yuyutsavaḥ means when two parties are fighting, they are called yuyutsavaḥ, "Desiring to fight, they prepared." So actually these two groups of brothers, cousin-brothers, they assembled there for fighting to decide their fate. So everything is clear. Dharma-kṣetre kuru-kṣetre samavetā, assembled, yuyutsavaḥ, for fighting. And who are they?
It is the question of Dhṛtarāṣṭra, the father of the Duryodhana, and he is asking his private secretary, Sañjaya. Sañjaya was relaying the fight in the battlefield, and Dhṛtarāṣṭra was blind. Just like television. So he was seeing the fight from the heart. It means there is still more finer science, that you don't require machine to see it by television, what is going outside; you can see within your heart. So this Sañjaya was seeing the battle, and he was relaying to Dhṛtarāṣṭra.
So point is that every word of Bhagavad-gītā, that is fact, historical, and very nicely composed and spoken by the greatest authority, Kṛṣṇa, who is accepted by all parties as the Supreme Personality of Godhead. There are parties of spiritual life in India. Just like Śaṅkarācārya's party, they are coming from very old time. I am speaking of the recent, modern age, say, within two thousand years. Modern means within two thousand years. Śaṅkarācārya age is about one thousand, five hundred years.