Mahabharata Drona Parva Chapter 121:3

Mahabharata Drona Parva (Jayadratha-Vadha Parva) Chapter 121:3 Then the illustrious son of Bharadwaja, by means of his sharp arrows and broad-headed shafts, cut off their heads, like a person plucking flowers from a tree. Deprived of life, those princes there, O king of great splendour, fell down from their cars on the earth, like the (slain) Daityas and Danavas in the battle between the gods and the Asuras in days of old. Having slain them in battle, O king, the valiant son of Bharadwaja shook his invincible bow, the back of whose staff was decked with gold. Beholding those mighty car-warriors, resembling the very celestials among the Panchalas slain, Dhrishtadyumna inflamed with rage, shed tears in that battle. Excited with wrath, he rushed, in that encounter, against Drona's car. Then, O king, cries of woe suddenly arose there at the sight of Drona covered with arrows by the prince of Panchala. Completely shrouded by the high-souled son of Prishata, Drona, however, suffered no pain. On the other hand, he continued to fight, smiling the while. The prince of the Panchalas then, furious with rage, struck Drona in the chest with many straight shafts. Deeply pierced by that mighty warrior, the illustrious son Of Bharadwaja sat down on the terrace of his car and fell into a swoon. Beholding him in that condition, Dhrishtadyumna endued with great prowess and energy, laid aside his bow and quickly took up a sword. That mighty car-warrior then, speedily jumping down from his own car, mounted that of Bharadwaja, O sire, in no time, his eyes red in wrath and impelled by the desire of cutting Drona's head from off his trunk. Meanwhile, the valiant Drona, regaining his senses, took up his bow and seeing Dhrishtadyumna arrived so near him from desire of slaughter, began to pierce that mighty car-warrior with shafts measuring a span only in length and therefore, fit to be used in close fight. Those arrows of the measure of a span and fit to be used in close fight, were known to Drona, O king! And with them he succeeded in weakening Dhrishtadyumna.