The Iliad by Homer Book 11 Page 14

havoc of the Trojan ranks, he is to keep aloof and bid the others bear the brunt of the battle, but when Agamemnon is wounded either by spear or arrow, and takes to his chariot, then will I vouchsafe him strength to slay till he reach the ships and night falls at the going down of the sun.”

Iris hearkened and obeyed. Down she went to strong Ilius from the crests of Ida, and found Hector son of Priam standing by his chariot and horses. Then she said, “Hector son of Priam, peer of gods in counsel, father Jove has sent me to bear you this message — so long as you see Agamemnon heading his men and making havoc of the Trojan ranks, you are to keep aloof and bid the others bear the brunt of the battle, but when Agamemnon is wounded either by spear or arrow, and takes to his chariot, then will Jove vouchsafe you