In book 5, Hera and Athena plot to harm Ares, who had been seen by Diomedes in assisting the Trojans. Diomedes called for his soldiers to fall back slowly. Hera, Ares' mother, saw Ares' interference and asked Zeus, Ares' father, for permission to drive Ares away from the battlefield. Hera encouraged Diomedes to attack Ares and he threw his spear at the god. Athena drove the spear into Ares' body, and he bellowed in pain and fled to Mount Olympus, forcing the Trojans to fall back.