The Mahabharata of Krishna-Dwaipayana Vyasa…
“ And a voice was heard in the sky applauding Drona, and saying, ‘Difficult is the feat performed by Drona, inasmuch as he fighteth with Arjuna,—that grinder of foes, that warrior endued with mighty energy, of firm grasp, and invincible in battle,—that conqueror of both celestials and Daityas, that foremost of all car-warriors.’ And beholding Partha’s infallibility, training, fleetness of hand, and the range also of Arjuna’s arrows, Drona became amazed. ”
