Mbh 6.52.2e

And in consequence of the ability and dexterity of the charioteers of both those warriors, both displayed, O king, beautiful circles and advancings and retreatings in respect of their moving cars. And, O monarch, seeing the opportunity to strike, they frequently changed positions, O king, for obtaining what they sought. And both the heroes blew their conches, mingling that blare with their leonine roars. And those mighty car-warriors twang their bows, both in the same manner. And with the blare of their conches and the rattle of their car-wheels, the very Earth was suddenly rent. And it began to tremble and produce subterranean noises. And nobody, O bull of Bharata’s race, could detect any latches in either of them. Both of them was possessed of great might and great courage in battle, each was other’s match. And by (the sight of) his standard alone, the Kauravas could approach him (for aid). And so the Pandavas approached Pritha’s son (for aid), guided by his standard only. And beholding, O king, prowess thus displayed by those two foremost of men, O Bharata, all creatures (present) in that battle were filled with wonder. And none, O Bharata, observed any difference between the two, just as none finds any transgression in a person observant of morality. And both of them (at times) became perfectly invisible in consequence of clouds of arrows. And soon enough both of them in that battle became visible. And the gods with Gandharvas and the Charanas, and the great Rishis beholding their prowess, said unto one another, ‘These mighty car-warriors when excited with rage, are incapable of ever being vanquished in battle by all the worlds with the gods, the Asuras and the Gandharvas. This highly wonderful battle would be wonderful in all the worlds. Indeed, a battle such as this will never take place again. Bhishma is incapable of being conquered in combat by Pritha’s son of great intelligence, showering his arrows in battle, with bow and car and steeds.