Mbh 6.64.1e

And those other elephants, excited with fury and each endued with four tusks, urged by Rakshasas of great strength, fell from all sides upon Bhagadatta’s elephant and afflicted him with their tusks. And the elephant of Bhagadatta, thus afflicted by those elephants, (already) struck with arrows and feeling great pain, uttered loud cries that resembled the thunder of Indra. And hearing those terrible and loud cries of that roaring elephant, Bhishma, addressing Drona, Suyodhana and all the kings, said, ‘The mighty bowman Bhagadatta is battling with the wicked-souled son of Hidimva, and hath fallen into great distress. That Rakshasa is of huge form, and the king also is very wrathful. Engaged in battle, they would certainly prove each other’s death. Loud shouts were also heard of the rejoicing Pandavas, and the cries of agony of (king Bhagadatta’s) terrified elephant. Blessed be ye, let us all go there for rescuing the king, for, if left unprotected, in battle, he will soon give up his life. Ye warriors of great energy, do, as I bid, even now. Ye sinless ones, make no delay. The combat deepens and becometh fierce, making the hair to stand on end. That commander of a division is high-born, endued with great bravery, and devoted to us. Ye warriors of unfading glory, it is meet that his rescue should be effected by us.’ Hearing these words of Bhishma, all the kings (of the Kuru army), headed by Bharadwaja’s son, desirous of rescuing Bhagadatta, proceeded with great speed to where the ruler of the Pragjyotishas was. And beholding the enemy advancing, the Panchalas with the Pandavas, headed by Yudhishthira, pursued them behind. Then that prince of Rakshasas, endued with great prowess, beholding that division (of the enemy) advance, uttered a fierce roar, deep as that of thunder.