Next Diomedes killed two sons of Dardan Priam
careering on in a single car, Echemrnon and Chromius,
As a lion charges cattle, calves and heifers
browsing the deep glades and snaps their necks,
so Tydides pitched them both from the chariot,
gave them a mauling – gave them little choice –
quickly stripped their gear and passed their team
to his men to lash back to the ships.
– Homer
The Iliad, Book 5, lines 178-185. The battle rages between the Achaeans and the Trojans and the Greek leader Diomedes is right there in the thick of it, killing many Trojans, despite having been hit by an arrow. In this passage an epic simile compares him to a lion charging cattle and snapping their necks.