Homer's Iliad Book 10 (translated by Robert Fagles)

Both worried about the Greek setbacks, Agamemnon and Menelaos meet at night and agree to work on sending spies to the Trojan camp. Agamemnon goes to Nestor's shelter, while Menelaos collects the other chiefs. Nestor addresses the collected leadership, and asks for volunteers to infiltrate the Trojan camp. Diomedes volunteers and chooses Odysseus to go with him. Odysseus' armor includes a helmet of boar-tusks (Mycenaean). After prayers to Athene, Odysseus and Diomedes set out. Meanwhile, Hektor has done the same thing on the Trojan side, choosing Dolon as his spy. Odysseus and Diomedes see Dolon coming, so they ambush him and chase him down. Odysseus interrogates Dolon, who answers all the questions without demur. Dolon describes the Trojan order of encampment, including the splendid chariot of the Thracian King Rhesos. Dolon pleads for his life, but Diomedes kills him anyway. Diomedes and Odysseus find the Thracians asleep, so they slaughter twelve of them and escape with the chariot and team of Rhesos, back to the Greek camp. On the way they pause to pick up the arms stripped from Dolon's corpse for a dedication to Athene.