Knowing that Troilos regularly left the city to water his horses, Achilles hid himself near the fountain-house. He waited until Troilos and his sister, Polyxena, were off their guard, then attacked. Troilos managed to leap on to one of the horses but swift-footed Achilles still caught and killed him, thus ensuring that Troy would fall. On the right, hiding behind the well, is the swordsman- Achilles. On top of the well are two acroteria in the form of white lions.
Water flows from the mouth of the right lion to a trough.
Olive trees at different stages of growth are shown on the panel below the main scene.