Sauptika Parva is the seventy-eighth Upa parva included in the tenth Maha parva named as Sauptika Parva. Vaishampayana continued the narration to Janamejaya in reply to his queries as follows.
What was the unbelievable message as asked by Dritarashtra?
Bhima, having the power of a thousand elephants, had killed all hundred Kauravas in the war. Dritharashtra could not believe this message of Sanjaya.
When did the Sauptika Parva really take place?
Sauptika parva was reported to Dritharashtra on the evening of the eighteenth night after the fall of all Kauravas including Duryodhana. Sauptika means history and the happenings during the sleeping time.
On the seventeenth day evening and at night when Duryodhana had hidden under water, in order to satisfy him, Ashvathama had done heinous actions. With Kritavarma and Kripa as his commandos for his safety, in Sauptika parva, the description of massacre violence of Ashvathama were described. Really, Vyasa had described it as on the seventeenth day night incidences. The cruel role of Ashvathama was described here. Krishna had finally intervened and blessed Pareekshit to live till sixty years.
What did Ashvathama do in the evening after the death of Shalya?
Ashvathama had called Kripa and Kritavarm, rode on their horses into the forest and sat together under a tree. On the tree, one owl had killed many other innocent birds. Ashvathama desired similarly, to kill the remaining Pandava soldiers since Bhima had killed all Kaurava brothers with soldiers except Duryodhana.
Hence, he called Kritavarma and Kripa and returned to the Pandava camps where soldiers were sleeping. Kritavarma had waited outside with a sword. Kripa had shone the lamp for Ashvathama. Ashvathama had killed Shikhandi and his charioteer, and then moved towards Drishtadyumna but the charioteer had escaped from the back door. The charioteer had ascended his horse and rode to report to Yudhishtira about the violence.

Ashvathama had killed Drishtadyumna and all the five Upa-pandavas since the facial resemblances were alike Pandavas. Ashvathama had thought he had killed Pandavas but later Yudhishtira had instructed Arjuna and Bhima to capture Ashvathama alive. Yudhishtira had instructed Nakula to bring all ladies from Upaplava including Uttarakumari there.
Continue reading