Arjuna fulfill his vow by killing the king of Sindhu? O hero, how could the son of Pandu, if Drona had not wished it.
भिन्द्यात् सुदुर्भिदं व्यूहं यतमानोऽपि संयुगे। प्रतिज्ञाया गतः पारं हत्वा सैन्धवमर्जुनः॥