Upapandavas, also known as Pandavaputras were the five sons born to Draupadi from Pandavas (one from each). They were Prativindhya, Shatanika, Sutasoma, Shrutasena and Shrutakarma.
They fought the battle on the side of the Pandavas and all five of them were killed by Ashwathama on the night of the last day of the war my mistake assuming to be Pandavas.
