Mahabharata Aswamedha Parva Chapter 82:2

Mahabharata Aswamedha Parva (Anugita Parva) Chapter 82:2 Then Dhananjaya, becoming angry, drew his bow with great force, and slew his antagonist's steeds and then struck off the head of his car-driver. With a razor-headed shaft he then cut off Meghasandhi's large and beautiful bow, and then his leathern fence. Then cutting off his flag and flag-staff, he caused it to fall down. The prince of Magadha, exceedingly afflicted, and deprived of his steeds and bow and driver, took up a mace and rushed with great speed at the son of Kunti. Arjuna then with many shafts of his equipt with vulturine feathers cut off into fragments, that mace of his advancing foe which was adorned with bright gold. Thus cut off into fragments, that mace with its begemmed bonds and knots all severed, fell on the Earth like a she-snake helplessly hurled down by somebody. When his foe became deprived of his car, his bow, and his mace, that foremost of warriors, viz., the intelligent Arjuna, did not wish to strike him. The ape-bannered hero then, comforting his cheerless foe who had been observant of Kshatriya duties, said unto him these words, "O son, thou hast sufficiently displayed thy adherence to Kshatriya duties. Go now. Great have been the feats, O king, which thou hast accomplished in battle although thou art very young in years. The command I received from Yudhishthira was that kings who oppose me should not be slain. It is for this thou livest yet, O monarch, although thou hast offended me in battle." Thus addressed, the ruler of Magadha considered himself vanquished and spared. Thinking then that it was his duty to do so, he approached Arjuna and joining his hands in reverence worshipped him. And he said, "Vanquished have I been by thee. Blessed be thou, I do not venture to continue the battle. Tell me what I am to do now for thee. Regard thy behest as already accomplished." Comforting him again, Arjuna once more said unto him, "Thou shouldst repair to the Horse-sacrifice of our king which takes place at the coming full moon of Chaitra." Thus addressed by him, the son of Sahadeva said, "So be it,"—and then duly worshipped that horse as also Phalguna, that foremost of warriors. The sacrificial horse then, equipt with beautiful manes, proceeded at his will along the sea-coast, repairing to the countries of the Bangas, the Pundras, and the Kosalas. In those realms Dhananjaya, with his bow Gandiva, O king, vanquished innumerable Mlechccha armies one after another.