Mbh 8.20.2d

Slaying then his foe's driver with a single shaft, and cutting off with a crescent-shaped arrow the bow also of that warrior whose twang resembled the roar of the clouds, Ashvatthama cut off his enemy's car into minute fragments. Checking with the weapons those of his enemy, and cutting off all the weapons of the latter, Drona's son, although he obtained the opportunity to do his enemy the crowning evil, still slew him not, from desire of battling with him for some time more. Meanwhile Karna rushed against the large elephant force of the Pandavas and began to rout and destroy it. Depriving car-warriors of their cars, he struck elephants and steeds and human warriors, O Bharata, with innumerable straight shafts. That mighty bowman, the son of Drona, although he had made Pandya, that slayer of foes and foremost of car-warriors, carless, yet he did not slay him from desire of fight. At that time a huge riderless elephant with large tusks, well-equipped with all utensils of war, treading with speed, endued with great might, quick to proceed against any enemy, struck with Ashvatthama's shafts, advanced towards the direction of Pandya with great impetuosity, roaring against a hostile compeer. Beholding that prince of elephants, looking like a cloven mountain summit, Pandya, who was well acquainted with the method of fighting from the neck of an elephant, quickly ascended that beast like a lion springing with a loud roar to the top of a mountain summit. Then that lord of the prince of mountains, striking the elephant with the hook, and inspired with rage, and with that cool care for which he was distinguished in hurling weapons with great force, quickly sped a lance, bright as Surya's rays, at the preceptor's son and uttered a loud shout. Repeatedly shouting in joy, "Thou art slain, Thou art slain!"