Odysseus was one of the most influential Greek champions during the Trojan War. Along with Nestor and Idomeneus he was one of the most trusted counsellors and advisors. He always championed the Achaean cause, especially when the king was in question, as in one instance when Thersites spoke against him. When Agamemnon, to test the morale of the Achaeans, announced his intentions to depart Troy, Odysseus restored order to the Greek camp.[21] Later on, after many of the heroes had left the battlefield due to injuries (including Odysseus and Agamemnon), Odysseus once again persuaded Agamemnon not to withdraw. Along with two other envoys, he was chosen in the failed embassy to try to persuade Achilles to return to combat.[22]
When Hector proposed a single combat duel, Odysseus was one of the Danaans who reluctantly volunteered to battle him. Telamonian Ajax, however, was the volunteer who eventually did fight Hector. Odysseus aided Diomedes during the successful night operations in order to kill Rhesus, because it had been foretold that if his horses drank from the Scamander River, Troy could not be taken.[23]
After Patroclus had been slain, it was Odysseus who counselled Achilles to let the Achaean men eat and rest rather than follow his rage-driven desire to go back on the offensive—and kill Trojans—immediately. Eventually (and reluctantly), he consented.
During the funeral games for Patroclus, Odysseus became involved in a wrestling match with Telamonian Ajax, as well as a foot race. With the help of the goddess Athena, who favoured him, and despite Apollo's helping another of the competitors, he won the race and managed to draw the wrestling match, to the surprise of all.[24]
Odysseus has traditionally been viewed in the Iliad as Achilles's antithesis: while Achilles's anger is all-consuming and of a self-destructive nature, Odysseus is frequently viewed as a man of the mean, renowned for his self-restraint and diplomatic skills. He is more conventionally viewed as the antithesis of Telamonian Ajax (Shakespeare's "beef-witted" Ajax) because the latter has only brawn to recommend him, while Odysseus is not only ingenious (as evidenced by his idea for the Trojan Horse), but an eloquent speaker, a skill perhaps best demonstrated in the embassy to Achilles in book 9 of the Iliad. The two are not only foils in the abstract but often opposed in practice since they have many duels and run-ins (for examples see the next section