Quintus Curtius Rufus, History of Alexander 8.14.32

8.14.32

Novem iam vulnera hinc tergo, illinc pectore exceperat multoque sanguine profuso languidis manibus magis elapsa quam excussa tela mittebat.

Hence the elephants, being at last spent with wounds, spread havoc among their own ranks, and threw their drivers to the ground, who were then trampled to death by their own beasts. They were therefore driven from the field of battle like a flock of sheep, as they were maddened with terror rather than vicious. Porus, meanwhile, being left in the lurch by the majority of his men, began to hurl from his elephant the darts with which he had beforehand provided himself, and while many were wounded from afar by his shot he was himself exposed as a butt for blows from every quarter. He had already received nine wounds before and behind, and became so faint from the great loss of blood that the darts were dropped rather than flung from his feeble hands. But his elephant, waxing furious though not yet wounded, kept charging the ranks of the enemy until the driver, perceiving the king's condition — his limbs failing him, his weapons dropping from his grasp, and his consciousness almost gone — turned the beast round and fled.