You know how formidable Drona is in battle, Drona who is regarded as the foremost of the Kuru warriors. You also know the vow he made before the eyes of all, O master.
जानीषे हि रणे द्रोणं रभसं श्रे. पम्मतम्। प्रतिज्ञा चापि ते नित्यं श्रुता द्रोणस्य माधव॥