Wikipedia
The Posthomerica is an epic poem by Quintus of Smyrna, probably written in the latter half of the 4th century, and telling the story of the Trojan War, between the death of Hector and the fall of Ilium.
The first four books, covering the same ground as the Coming of Memnon of Arctinus of Miletus, describe the doughty deeds and deaths of Penthesileia the Amazon, of Memnon, son of the Morning, and of Achilles; and the funeral games in honour of Achilles.
Books five through twelve, covering the same ground as the Little Iliad of Lesches, span from the contest between Ajax and Odysseus for the arms of Achilles, the death of Aias of suicide after his loss, the exploits of Neoptolemus, Eurypylus and Deiphobus, the deaths of Paris and Oenone, to the building of the wooden horse.
The remaining books, covering the same ground as Arctinus' Destruction of Troy, relate the capture of Troy by means of the wooden horse, the sacrifice of Polyxena at the grave of Achilles, the departure of the Greeks, and their dispersal by the storm.