Mahabharata Drona Parva Chapter 172:2

Mahabharata Drona Parva (Ghatotkacha-badha Parva) Chapter 172:2 In consequence of the light that was amongst the Kaurava troops, the flight of the foe could be ascertained. Those mighty car-warriors, viz., Drona and Karna, O king, pursued the flying host, scattering numerous shafts. Seeing the Panchalas slaughtered and routed, Janardana becoming cheerless, said these words unto Phalguna, "Dhrishtadyumna and Satyaki, accompanied by the Panchalas, had proceeded against those great bowmen, viz., Drona and Karna, shooting many shafts. This large host of ours hath been broken and routed (by them) with showers of arrows. Though their flight is sought to be checked, they are still incapable of being rallied, O son of Kunti!—Beholding the host fly away, through fear, ye Pandava warriors, cast away your fears! Accompanied by all the forces and arraying then, in good order, both of us, with uplifted weapons, are even now proceeding against Drona and the Suta's son for withstanding them." Then Janardana beholding Vrikodara advancing, once more addressed Arjuna, the son of Pandu, as if for gladdening him, in these words, "Yonder Bhima, who taketh delight in battle, surrounded by the Somakas and the Pandavas, is coming against those mighty car-warriors, viz., Drona and Karna. Supported by him, as also by the many mighty car-warriors among the Pandavas, fight now, O son of Pandu, for assuring all your troops. Then those two tigers among men, viz., the son of Pandu and he of Madhu's race, approaching Drona and Karna, took up their station at the head of battle. Sanjaya continued, 'Then that vast force of Yudhishthira once more returned to battle, proceeding to the place where Drona and Karna were grinding their foes in battle. At dead of night, a fierce encounter took place, resembling that of two oceans swelling at moon-rise. Then the warriors of thy army, throwing away from their hands the blazing lamps held by them, fought with the Pandavas fearlessly and madly. On that terrible night when the world was enveloped with gloom and dust, the combatants fought with one another, guided only by the names they uttered. The names uttered by the kings contending in battle, were heard, O monarch, there, like what happens, O king, at a Swayamvara or self-choice. Suddenly, a silence overspread the field of battle, and lasted for a moment. Then, again, a loud uproar was heard made by the angry combatants, victors and vanquished. Thither where blazing lamps were seen, O bull of Kuru's race, thither rushed those heroes like insects (towards a blazing fire). And as the Pandavas, O king, and the Kauravas, contended with each other in battle, the darkness of night thickened around them.