Dronacharya was repeatedly overpowered and countered by Yudhishthira let alone Arjuna.
He failed to capture Yudhishthira and proceeded to assault drupada soldiers.
- O descendant of the Bharata lineage! He released the aindra and prajapatya weapons. He wished to kill the son of dharma and was devoted to ensuring your son’s welfare. The lord of the Kurus possessed the gait of an elephant and a lion. He was broad in the chest and his eyes were large and red. His energy was not inferior. He invoked the mahendra weapon and destroyed those weapons. On seeing that his weapons had been destroyed, Drona was overcome with anger. Wishing to destroy Yudhishthira, he unleashed the brahma weapon.Everything was covered in darkness and we could see nothing. O lord of the earth! All the beings were full of great terror. O Indra among kings! On seeing that a brahmastra had been invoked, Yudhishthira, Kunti’s son, used a brahmastra to counter it. At this, all the foremost of warriors praised those bulls among men. ‘“Drona abandoned Kounteya and attacked Drupada’s soldiers.
Arjuna countered every weapon of Dronacharya even while extremely holding back against him
- Whenever Drona tried to do something to defeat Kunti’s son, he was swiftly nullified by the striving Pandava. Drona could not establish his superiority over Pandava in any way. The one who was skilled about the motions of weapons then invoked special weapons—aindra, pashupata, tvashtra, vayavya and varuna. However, as soon as these were released from Drona’s bow, Dhananjaya destroyed them. When his weapons were duly destroyed by Pandava’s weapons, Drona released supreme and divine weapons towards Partha. However, every weapon that was invoked with a desire to vanquish Partha, was duly destroyed by Arjuna with another weapon. When those weapons, including the divine ones, were duly destroyed by Arjuna, Drona honoured Arjuna in his mind.
Partha invoked aindastra to defeat Bhisma , karna , Drona and ashwatthama on 9th day all together . He was way too powerful for Kauravas