After several failed attempts to capture Yudhisthir, Drona and Duryodhan summoned King Bhagadatta, the monarch of Pragjyotisha, modern day Assam.
Bhagadatta attacked Arjuna with his gigantic elephant named Suprateeka in a fierce battle in which Bhagadatta matched Arjuna. Drona continued to try and capture Yudhisthira, which again failed as Pandavas however fought harder and delivered severe blows to the Kaurava army.
By: Archa Dave