Mbh 3.171.1a

“Arjuna continued, ‘Remaining invisible the Daityas began to fight with the help of illusion. And I too fought with them, resorting to the energy of visible weapons. And the shafts duly discharged from the Gandiva, began to sever their heads at those different places where they were respectively stationed. And thus assailed by me in the conflict, the Nivata-Kavachas, all on a sudden withdrawing the illusion, entered into their own city. And when the Daityas had fled, and when all had become visible, I there discovered hundreds and thousands of the slain. And there I saw by hundreds their shivered weapons, ornaments, limbs, and mail. And the horses could not find room for moving from one place to another; and on a sudden with a bound, they fell to coursing in the sky. Then remaining invisible, the Nivata-Kavachas covered the entire welkin with masses of crags. And, O Bharata, other dreadful Danavas, entering into the entrails of the earth, took up horses’ legs and chariot-wheels. And as I was fighting, they, hard besetting my horses with rocks, attacked me together with (my) car. And with the crags that had fallen and with others that were falling, the place where I was, seemed to be a mountain cavern. And on myself being covered with crags and on the horses being hard pressed, I became sore distressed and this was marked by Matali. And on seeing me afraid, he said unto me, ‘O Arjuna, Arjuna! be thou not afraid; send that weapon, the thunder-bolt, O lord of men.’ Hearing those words of his, I then discharged the favourite weapon of the king of the celestials--the dreadful thunderbolt. And inspiring the Gandiva with mantras, I, aiming at the locality of the crags, shot sharpened iron shafts of the touch of the thunder-bolt. And sent by the thunder, those adamantine arrows entered into all those illusions and into the midst of those Nivata-Kavachas. And slaughtered by the vehemence of the thunder, those Danavas resembling cliffs, fell to the earth together in masses.