Yes. Although Ralph has insisted throughout the novel on the importance of a fire to signal passing ships, what ultimately attracts a ship is not Ralph’s fire but the massive blaze set by Jack in order to kill Ralph. While pursuing Ralph through the forest, Jack sets a huge fire to scare Ralph into the open. A passing British Navy ship sees the fire and sends an officer ashore. The officer not only saves Ralph from being murdered by Jack, he also saves all the boys from the further violence that would surely have occurred had they stayed on the island.