Mbh 6.72.1c

Then Bhishma, aiming an exceedingly fierce shaft, felled the charioteer of the Vrishni hero from his box in the car. And when the charioteer of Satyaki’s car was thus slain, his steeds, O king, bolted away. Endued with the speed of the tempest or the mind, they ran wild over the field. Then cries were uttered by the whole army which became a loud uproar. And exclamation of oh and alas arose from the high-souled warriors of the Pandava army. And those cries-said--‘Run, seize, check the horses, go in haste.’ And this uproar followed Yuyudhana’s car. Meanwhile, Bhishma the son of Santanu began to slay the Pandava forces like Indra slaying the Danavas. But the Panchalas and the Somakas, though slain by Bhishma thus, forming yet a laudable resolution, rushed towards Bhishma. And other warriors of the Pandava army, headed by Dhrishtadyumna, and desirous of slaughtering the ranks of thy son, rushed towards Santanu’s son in that battle. And so also, O king, the warriors of thy army, headed by Bhishma and Drona, impetuously rushed towards their foes. And thereupon another battle took place.”