Mbh 10.8.14

"'As Ashvatthama careered in this way, slaughtering thousands of men, the deep night became more terrible in consequence of the darkness that set in. The earth became terrible to behold, strewn with thousands of human beings dead and dying and innumerable steeds and elephants. Cut off by the enraged son of Drona, his foes fell down on the earth that was then crowded with Yakshas and Rakshasas, and frightful with (broken) cars and slain steeds and elephants. Some called upon their brothers, some upon their sires, and some upon their sons. And some said, "The Dhartarashtras in rage could never accomplish such feats in battle as these which Rakshasas of wicked deeds are achieving (upon us) during the hour of sleep! It is only in consequence of the absence of the Parthas that this great slaughter is going on. That son of Kunti, who hath Janardana for his protector, is incapable of being vanquished by gods, Asuras, Gandharvas, Yakshas and Rakshasas! Devoted to Brahma, truthful in speech, self-restrained, and compassionate towards all creatures, that son of Pritha, called Dhananjaya, never slaughters one that is asleep, or one that is heedless, or one that has laid aside his weapons or one that has joined his hands in supplication, or one that is retreating, or one whose locks have been dishevelled. Alas, they are Rakshasas of wicked deeds who are perpetrating such terrible act upon us." Uttering such words, many laid themselves down.