The summary provides a high-level overview of Books IX-XIV of The Iliad in 3 sentences:
In Book IX, an embassy is sent to Achilles to convince him to rejoin the fight, but he refuses unless the Greeks are threatened. In Book X, Diomedes and Odysseus spy on the Trojans and kill their leader Rhesus. Book XI describes fighting where Agamemnon, Diomedes, and Odysseus are wounded while Achilles remains absent.