The Great Epic of the Bhārata dynasty 7.170.3

7.170.3

śūlakravyādasaṃghuṣṭaṃ bhūtayakṣagaṇākulam |
nihatya śātravānbhallaiḥ so'cinoddehaparvatam || 3 ||

"Sanjaya said, 'Then Drona's son began to cause a great carnage amongst his foes in that battle, like the Destroyer himself at the end of the Yuga. Slaying his enemies by means of his broad-headed arrows, Aswatthaman soon piled a mountain there of the dead. The standards of cars formed its trees; and weapons its pointed summits; the lifeless elephants formed its large rocks; the steeds, its Kimpurushas; and bows, its creepers and plants. And it resounded with the cries of all carnivorous creatures, that constituted its feathery population. And the spirits that walked there formed its Yakshas. Then roaring aloud, O bull of Bharata's race, Aswatthaman once more repeated his vow in the hearing of thy son, thus, 'Since Kunti's son, Yudhishthira, assuming only the outward garb of virtue, had caused the preceptor who was (righteously) engaged in battle to lay aside his weapons, I shall, in his very sight, rout and destroy his army. Having mangled all his troops, I shall, then, slay the sinful prince of the Panchalas. Indeed, I shall slay all of them, if they contend with me in battle. I tell thee truly, therefore, rally thou thy troops.' Hearing these words of Aswatthaman, thy son rallied the troops, having dispelled their fears with a loud leonine, roar. The encounter, then, O king, that once more took place between the Kuru and the Pandava armies, became as terrible as that of two oceans at full tide. The terrified Kauravas had their fears dispelled by Drona's son.