Sauptika Parva describes the night attack on the Pandava military camp by Drona's son Ashwathama. He was installed commander by the dying Duryodhana, after he was hit by Bhima in a mace fight. Ashwathama, preceptor Kripa and Yadava Kritavarma, secretly entered into the military camp of the Pandavas. They slew all the surviving heroes like the Panchala prince Dhristadyumna and the sons of Pandavas by Panchali. This was a brutal massacre flouting all the norms of a rightful battle. The Pandavas became aware of the battle only next day morning as they camped in a place quite far away from the Panchala camp. Knowing about the heinous act, the Pandavas chased Ashwathama and revenged him for the death of their brother in law Dhristadyumna and their sons by Panchali.
The Panchala army camp under attack by Ashwathama.