Quintus Curtius Rufus, History of Alexander 8.14.27

8.14.27

Obtriti ergo pedibus earum ceteris, ut parcius instarent, fuere documentum.

Some, however, by pursuing too eagerly, so irritated the animals with wounds that they turned their rage upon them, and they were in consequence trampled to death under their feet, thus warning others to attack them with greater caution. The most dismal of all sights was when the elephants would, with their trunks, grasp the men, arms and all, and hoisting them above their heads, deliver them over into the hands of their drivers. Thus the battle was doubtful, the Macedonians sometimes pursuing and sometimes fleeing from the elephants, so that the struggle was prolonged till the day was far spent. Then they began to hack the feet of the beasts with axes which they had prepared for the purpose, having besides a kind of sword somewhat curved like a scythe, and called a chopper, wherewith they aimed at their trunks. In fact, their fear of the animals led them not only to leave no means untried for killing them, but even for killing them with unheard-of forms of cruelty.