"The first 9 books, beginning with the quarrel of Achilles and Agamemnon, culminate in the embassy, in which Achilles reiterates his position, and refuses to accept Agamemnon's first attempt at reconciliation.
In the next 7 books (10-16), the Trojans grow even closer to burning the Greek fleet, until Patroclus enters the battle and is killed.
The final sequence of poems, Books 17-24, show how Achilles' feelings are transformed after the death of Patroclus." -Wilson p.xxv
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"Book 1-4 trace the failure of diplomatic solutions. Books 5-9 show the rise of Hector...Books 10-11 evoke two Greek missions into hostile spaces, one unsuccessful and one successful...Books 11-15 focus on what is often dubbed the Great Battle...in book 16, Patroclus dies. Books 17-22 describe the return of Achilles to the battlefield. Books 23 and 24 are another pair with...scenes of lament." Wilson p.xxv