Mbh 7.179.4c

The gods Indra at their head are slaying us for the sake of the Pandavas!” At that time there was none that could rescue the sinking Bharata troops. During that fierce uproar and rout and extermination of the Kauravas, the camps losing their distinctive features, the parties could not be distinguished from each other. Indeed, during that terrible rout in which the soldiers showed no regard for one another, every side of the field, when looked at, seemed to be empty. Only Karna, O king, could be seen there, drowned in that shower of weapons. Then Karna covered the welkin with his shafts, contending with that celestial illusion of the Rakshasa. The Suta’s son, endued with modesty and achieving the most difficult and noble feats, did not lose his senses in that battle. Then, O king, all the Saindhavas and Valhikas affrightedly looked at Karna who kept his senses in that fight. And they all worshipped him, while they looked at the triumph of the Rakshasa. Then a Sataghni equipped with wheels, hurled by Ghatotkacha, slew the four steeds of Karna simultaneously. These dropped down on the ground, on their knees, deprived of life, teeth, eyes, and tongues. Then jumping down from his steedless car and seeing the Kauravas flying away, and beholding his own celestial weapon baffled by the Rakshasa illusion, Karna, without losing his senses, turned his mind inwards and began to reflect on what he should next do. At that time all the Kauravas, beholding Karna and that terrible illusion (of the Rakshasa) cried out saying, “O Karna, slay the Rakshasa soon with thy dart. These Kauravas and the Dhartarashtras are on the point of being annihilated. What will Bhima and Arjuna do to us? Slay this wretched Rakshasa at dead of night, who is consuming us all. They that will escape from this dreadful encounter to-day will fight with the Parthas in battle. Therefore, slay this terrible Rakshas now with that dart given thee by Vasava.