The Trojan Horse is not missing from the Iliad. It happens later.

This surprises readers because modern retellings tend to package the Trojan War as one continuous story: Paris takes Helen, the Greeks sail to Troy, Achilles fights Hector, the wooden horse enters the city, and Troy burns.

The Iliad is not that story.

The Iliad covers only a small part of the war

When the poem opens, the Greeks have already been at Troy for nine years. Its subject is the anger of Achilles, beginning with his quarrel with Agamemnon and moving through the death of Patroclus, Achilles' return to battle, the killing of Hector, and the strange, humane encounter between Achilles and Priam.

Then it stops.

The final scene is Hector's funeral. Troy is still standing. Achilles is still alive. Paris is still alive. The Horse has not been built.

This is one reason the poem has the shape it does. It is not a chronicle. It selects one crisis from a much larger legendary war.

The Horse does appear in Homeric poetry

If by “Homer” we mean the Iliad and Odyssey, the Horse is very much present.

In Book 4 of the Odyssey, Menelaus remembers sitting inside it with the other Greek warriors while Helen circles the structure, calling out in the voices of their wives. Odysseus prevents the men from answering. The passage is discussed and translated here by the Center for Hellenic Studies.

In Book 8, Odysseus asks the bard Demodocus to sing of the wooden horse made by Epeius with Athena's help, filled with Greek warriors and brought into Troy as a stratagem. That episode is in the Odyssey itself.

So the Horse is not some late invention that Homer never knew. It belongs to the traditional story beyond the endpoint of the Iliad.

Ancient readers had more Trojan War poetry than we do

The Iliad and Odyssey survived complete. Other early Greek epics about Troy did not.

The lost poems of the Epic Cycle filled in much of the narrative around them. A surviving summary attributed to Proclus tells us that the Little Iliad included Epeius constructing the Horse, the best Greek warriors entering it, and the rest of the army sailing away to Tenedos. The following Iliou Persis, or Destruction of Ilion, carried the story through the debate over the Horse and the sack of Troy. The Center for Hellenic Studies publishes the surviving summaries.

An ancient audience therefore encountered the Trojan War as a body of stories larger than any one poem.

The version most people picture is partly Roman

Many of the details that dominate the modern imagination arrive in their most famous surviving form much later, especially in Book 2 of Vergil's Aeneid: Sinon, Laocoön's warning, the serpents, the Trojans hauling the Horse into the city, and the Greeks emerging at night. Vergil's account is here.

Vergil did not invent the Horse. He inherited an old Greek tradition and gave it a Roman masterpiece of a telling.

The omission tells you what kind of poem the Iliad is

The Iliad could have raced forward to Troy's destruction. Instead it ends with enemies briefly recognizing each other's grief.

That is not an incomplete ending. It is the point.

The city will fall. Hector knows it, Andromache knows it, and the audience knows it. The poem does not need to show the Horse because its deepest interest is elsewhere: rage, mortality, honor, pity, and what happens when a man who has become almost inhuman recognizes another human being in front of him.

A relevant Ulix tool

Breaker of Horses

Breaker of Horses includes the complete Iliad and Odyssey in Homeric Greek and in the Butler, Pope, and Chapman translations. Read the Iliad through Hector's funeral, then open the Odyssey to Books 4 and 8 if you want Homer's Horse.