Drona borrowed a bow, fixed an arrow on the string and sent it right into the ring. The arrow rebounding brought up the ring and the brahmana handed it to the prince with a smile. Seeing these feats, the princes were astonished and said: "We salute you, O brahmana. Who are you? Is there anything we can do for you?" and they bowed to him. He said: "O princes, go to Bhishma and learn from him who I am." From the description given by the princes, Bhishma knew that the brahmana was none other than the famous master Drona. He decided that Drona was the fittest person to impart further instruction to the Pandavas and the Kauravas. So, Bhishma received him with special honor and employed him to instruct the princes in the use of arms. As soon as the Kauravas and the Pandavas had acquired mastery in the science of arms, Drona sent Karna and Duryodhana to seize Drupada and bring him alive, in discharge of the duty they owed to him as their master. They went as ordered by him, but could not accomplish their task. Then the master sent forth Arjuna on the same errand. He defeated Drupada in battle and brought him and his minister captives to Drona. Then Drona smilingly addressed Drupada: "Great king, do not fear for your life. In our boyhood we were companions but you were pleased to forget it and dishonor me. You told me that a king alone could be friend to a king. Now I am a king, having conquered your kingdom. Still I seek to regain my friendship with you, and so I give you half of your kingdom that has become mine by conquest. Your creed is that friendship is possible only between equals. And we shall now be equals, each owning a half of your kingdom." Drona thought this sufficient revenge for the insult he had suffered, set Drupada at liberty and treated him with honor. Drupada's pride was thus humbled but, since hate is never extinguished by retaliation, and few things are harder to bear than the pangs of wounded vanity, hatred of Drona and a wish to be revenged on him became the ruling passion of Drupada's life. The king performed tapas, underwent fasts and conducted sacrifices in order to win the gratified gods to bless him with a son who should slay Drona and a daughter who should wed Arjuna. His efforts were crowned with success with the birth of Dhrishtadyumna who commanded the Pandava army at Kurukshetra and, helped by a strange combination of circumstances, slew the otherwise unconquerable Drona, and birth of Draupadi, the consort of the Pandavas.