sentences:  On the higher floors, dart throwers, among others, were stationed.Despite the seemingly indestructible design of the Helepolis, many of the iron plates were dislodged during the siege, rendering the great machine highly vulnerable.Fearing that the laboriously constructed Helepolis would fall victim to the intense fire that was directed towards it, Demetrius I of Macedon ordered that it be withdrawn from the war field to prevent any further damage.