Mbh 6.96.1g

Just at this time that son of Pandu who had Krishna for his charioteer, O king, slaughtering the foe on all sides as he came, appeared at that spot where those tigers among men, those mighty car-warriors, viz., Bhimasena and Ghatotkacha, sire and son, were engaged with the ruler of the Pragjyotishas. Beholding his brothers, those mighty car-warriors, engaged in battle, that son of Pandu quickly commenced to fight, profusely scattering his shafts, O chief of the Bharatas. Then that mighty car-warrior, viz., king Duryodhana, speedily urged on a division of his troops abounding with cars and elephants. Towards that mighty division of the Kauravas thus advancing with impetuosity, Arjuna of white steeds rushed with great impetuosity. Bhagadatta also, upon that elephant of his, O Bharata, crushing the Pandava ranks, rushed towards Yudhishthira. Then commenced a fierce battle between Bhagadatta, O sire, and the Panchalas, the Srinjayas, and the Kekayas, with upraised weapons. Then Bhimasena, in that battle told both Kesava and Arjuna in detail about the slaughter of Iravat as it had occurred.”