The spirit of Achilles takes its revenge
Just before the Greeks left Troy to go back home, the spirit of Achilles appeared to them and demanded payment for all the fighting he had done. He wanted the blood of Polyxena, the daughter of the king of Troy.
The picture shows the son of Achilles (a little to the left of centre) cutting the throat of Polyxena. Three Greek soldiers hold her log-like body, as the blood from Polyxena's throat runs down onto the tomb of Achilles.
And so the war ended.