The Greek commanders sleep well that night, with the exception of Agamemnon and Menelaus. Eventually, they rise and wake the others. They convene on open ground, on the Trojan side of their fortifications, to plan their next move. Nestor suggests sending a spy to infiltrate the Trojan ranks, and Diomedes quickly volunteers for the role. He asks for support, and Odysseus steps forward. The two men arm themselves and set off for the Trojan camp. A heron sent by Athena calls out on their right-hand side, and they pray to Athena for protection.
Meanwhile, the Trojans devise their own acts of reconnaissance. Hector wants to know if the Achaeans plan an escape. He selects Dolon, an unattractive but lightning-quick man, to serve as his scout, and promises to reward him with Achilles’ chariot and horses once the Achaeans fall. Dolon sets out and soon encounters Diomedes and Odysseus. The two men interrogate Dolon, and he, hoping to save his life, tells them the positions of the Trojans and all of their allies. He reveals to them that the Thracians, newly arrived, are especially vulnerable to attack. Diomedes then kills Dolon and strips him of his armor.
The two Achaean spies proceed to the Thracian camp, where they kill twelve soldiers and their king, Rhesus. They also steal Rhesus’s chariot and horses. Athena warns them that some angry god may wake the other soldiers; Diomedes and Odysseus thus ride Rhesus’s chariot back to the Achaean camp. Nestor and the other Greeks, worried that their comrades had been killed, greet them warmly.