The story of the eighth day war of Mahabharata.Irwana the son of Arjuna and Uloopi(Nagkanya)fought bravely and killed many armyman of Karavas.Arjuna was depressed to see the dead bodies of war vicitims of both side as he told to Kirsana that all were his borthers .Lord Krishna speaks about Karma and result is in the hand of God.. don't worry and do your Karma.