Mbh 7.193.1f

Dhrishtadyumna was filled with great joy, and uttered leonine shouts, whirling his sword. Of a dark complexion, with white locks hanging down to his ears, that old man of five and eighty years of age, used, for thy sake only, to career on the field of battle with the activity of a youth of sixteen. The mighty-armed Dhananjaya, the son of Kunti, (before Drona’s head was cut off) had said, “O son of Drupada, bring the preceptor alive, do not slay him. He should not be slain.” Even thus all the troops also had cried out. Arjuna, in particular, melted with pity, had cried out repeatedly. Disregarding, however, the cries of Arjuna as also these of all the kings, Dhrishtadyumna slew Drona, that bull among men, on the terrace of his car. Covered with Drona’s blood, Dhrishtadyumna then jumped from the car down upon the ground. Looking red like the sun, he then seemed to be exceedingly fierce. Thy troops beheld Drona slain even thus in that battle. Then Dhrishtadyumna, that great bowman, O king, threw down that large head of Bharadwaja’s son before the warriors of thy army. Thy soldiers, O monarch, beholding the head of Bharadwaja’s son, set their hearts on flight and ran away in all directions. Meanwhile Drona, ascending the skies, entered the stellar path. Through the grace of the Rishis Krishna (Dwaipayana), the son of Satyavati, I witnessed, O king, the (true circumstances about the) death of Drona. I beheld that illustrious one proceeding, after he had ascended the sky, like a smokeless brand of blazing splendour. Upon the fall of Drona, the Kurus, the Pandavas and the Srinjayas, all became cheerless and ran away with great speed. The army then broke up. Many had been slain, and many wounded by means of keen shafts. Thy warriors (in particular), upon the fall of Drona, seemed to be deprived of life. Having sustained a defeat, and being inspired with fear about the future, the Kurus regarded themselves deprived of both the worlds. Indeed, they lost all self-control.