At the bottom , he is dragging the headless body behind his horse .
Near the top of the left panel , the raised sword is held by Achilles who is about to behead the helpless Troilus .
At the bottom , Achilles is dragging the headless body behind Achilles ' horse .
Near the top of the left panel , the raised sword is held by Achilles who is about to behead the helpless Troilus .