Ghoshayatra Parva
After Pandavas lost in dice game and went on for exile, Duryodhana planned to humiliate Pandavas by showing them the luxuries enjoyed by all Kauravas and Karna. So all of them had set to forest where Pandavas were living. In the course of Journey, Duryodhana abducted a lady without knowing that she was a Gandharva. Then Gandharvas attacked entire Kauravas and Karna. Kauravas and Karna got defeated. Karna tried run away from battle-field after getting defeated by Chitrasena but he couldn't since Gandharvas captured all Kauravas and Karna.[1] On knowing this, Yudhishtira asked Bhima and Arjuna to free them since its Hastinapur which would be insulted. Bhima and Arjuna followed his eldest brother's order and first requested Chitrasena to release Kauravas and Karna. Chitrasena rejected and asked Bhima and Arjuna to fight with him in order to free Kauravas and Karna. Thus a battle took place. Arjuna and Bhima defeated many warriors. Chitrasena became invisible and started fighting with Arjuna. Arjuna used Shabdavedi astra and captured Chitrasena. Bhima alone defeated his whole army. During the fight with Chitrasena, Arjuna had performed extremely impossible feats as he killed 10 lakh Gandharvas (4.5 akshouni) in single shot by using Agneyastra.[2] Bhima killed 15 lakh Gandharvas and defeated 10 lakh Gandharavas. Apart from Bhima and Arjuna, no warrior ever achieved this impossible feats even in dreams. Finally Bhima and Arjuna made Kauravas and Karna free. Chitrasena got impressed with Bhima and Arjuna's skills and granted Arjuna Sammohanastra and Bhima Shakti Gada of Shiva.