Ptolemy's light troops spring their trap, boards with spikes linked together by chains. Diodorous Siculus (Bk. XIX 84.1-6) using the lost source of Hieronymous of Cardia (who was present at the battle), says that these stopped the elephants in their tracks. The anti-elephant devices are scratch built by Leroy Simpson who also painted many of Nathan's Greeks (he also painted the shields of my Greeks).