Mbh 6.92.2a

Sanjaya said, “Beholding Iravat slain in battle, the Rakshasa Ghatotkacha, the son of Bhimasena, uttered loud shouts. And in consequence of the loudness of those roars, the earth having the ocean for her robes, along with her mountains and forests, began to tremble violently. And the welkin also and the quarters both cardinal and subsidiary, all trembled. And hearing those loud roars of his, O Bharata, the thighs and other limbs of the troops began to tremble, and sweat also appeared on their persons. And all thy combatants, O king, became cheerless of heart. And all over the field the warriors stood still, like an elephant afraid of the lion. And the Rakshasa, uttering those loud roars resembling the rattle of thunder, assuming a terrible form, and with a blazing spear upraised in hand, and surrounded by many bulls among Rakshasas of fierce forms armed with diverse weapons, advanced, excited with rage and resembling the Destroyer himself at the end of the Yuga. Beholding him advance in wrath and with a terrible countenance, and seeing also his own troops almost all running away from fear of that Rakshasa, king Duryodhana rushed against Ghatotkacha, taking up his bow with arrow fixed on the string, and repeatedly roaring like a lion. Behind him proceeded the ruler of the Vangas, with ten thousand elephants, huge as hills, and each with juice trickling down. Beholding thy son, O king, (thus) advancing surrounded by that elephant division, that ranger of the night (viz., Ghatotkacha) was highly inflamed with rage. Then commenced a battle with utmost vehemences that made the hair stand on end, between the formidable Rakshasa and the troops of Duryodhana. And beholding also that elephant division risen (on the horizon) like a cloud, the Rakshasas, inflamed with rage, rushed towards it, weapons in hand, and uttering diverse roars like clouds charged with lightning.