Mbh 10.8.6

"'Having slain Yudhamanyu thus, that hero proceeded against the other car-warriors of the king, who were all asleep. He slew all those trembling and shrieking warriors like animals in a sacrifice. Taking up his sword then, he slew many others. Proceeding along the diverse paths of the camp, one after another, Ashvatthama, accomplished in the use of the sword, beheld diverse gulmas and slew in a trice the unarmed and tired warriors sleeping within them. With that excellent sword he cut off combatants and steeds and elephants. Covered all over with blood, he seemed then to be Death himself commissioned by time. Causing his foes to tremble by the repeated blows of his sword that were of three kinds, Ashvatthama became bathed in blood. Covered as he was with blood, and wielding as he did a blazing sword, his form, as he careered in battle, became exceedingly terrible and superhuman. Those who awaked from sleep, O Kaurava, became stupefied with the loud noise (they heard around). Beholding Drona's son, they looked at each other's faces and trembled (with fear). Those Kshatriyas, beholding the form of that crusher of foes, believed him to be a Rakshasa and closed their eyes.