Mbh 14.75.1a

"Vaisampayana said, 'That foremost of steeds then proceeded to the realm of Pragjyotisha and began to wander there. At this, Bhagadatta's son, who was exceedingly valorous in battle, came out (for encountering Arjuna). King Vajradatta, O chief of the Bharatas, finding the (sacrificial) steed arrived within his realm, fought (for detaining it). The royal son of Bhagadatta, issuing out of his city, afflicted the steed that was coming (and seizing it), marched back towards his own place. Marking this, the mighty-armed chief of the Kuru race, speedily stretched his Gandiva, and suddenly rushed towards his foe. Stupefied by the shafts sped from Gandiva, the heroic son of Bhagadatta, letting off loose the steed, fled from Partha.[191] Once more entering his capital, that foremost of kings, irresistible in battle, cased himself in mail, and mounting on his prince of elephants, came out. That mighty car-warrior had a white umbrella held over his head, and was fanned with a milk-white yak-tail. Impelled by childishness and folly, he challenged Partha, the mighty car-warrior of the Pandavas, famed for terrible deeds in battle, to an encounter with him. The enraged prince then urged towards Arjuna that elephant of his, which resembled a veritable mountain, and from whose temples and mouth issued streams of juice indicative of excitement. Indeed, that elephant showered its secretions like a mighty mass of clouds pouring rain. Capable of resisting hostile feats of its own species, it had been equipped agreeably to the ordinances of the treatises (on war-elephants). Irresistible in battle, it had become so infuriate as to be beyond control. Urged on by the prince with the iron-hook, that mighty elephant then seemed (as it advanced) as if it would cut through the welkin (like a flying hill). Beholding it advance towards him, O king, Dhananjaya, filled with rage and standing on the earth, O Bharata, encountered the prince on its back.