Achilles refuses but agrees to let Patroclus wear his armour and lead the Myrmidons to save the Greeks. Believing they have seen Achilles, the Trojans beat a retreat. After killing Sarpedon, Zeus's son, Patroclus is filled with confidence and marches on Troy. First he is pushed back by Apollo, then he is killed by Hector, the eldest son of King Priam. Upon hearing this news, Achilles breaks down and vows to avenge the death of his friend. His mother Thetis promises to return the following morning with new armour and weapons for him.