The war of Kurukshetra was narrated to Dhritarashtra by

Explanation

In the Mahabharata, Sanjay was granted divine vision by sage Vyasa, enabling him to observe the events of the Kurukshetra war from afar. He narrated the events of the battlefield to the blind king Dhritarashtra. The dialogue of the Bhagavad Gita is also presented through Sanjay's narration.