When Jayadratha threw the caravan thread in front of the Pandava army in distress, this resulted in Arjuna and Bhima fighting with him. Arjuna created the head of a divine vimana (cave or a place of battle for refugees) and enclosed Jayadratha in it.
As a result, Duryodhana’s concern increased seeing the crisis before him and seeing the powers of Arjuna and Bhima. Duryodhana was worried about the vastness of the Maharathi warriors by the Pandavas, due to which they feared defeat in the war.
This battle scene in the Mahabharata is known as Jayadratha Vadh, which showcased the courageous fighting skills and powers of Arjuna and Bhima. This incident revealed many important aspects of the Mahabharata in a very significant way and was one of the core events of the war.