it is ironic that Jack used fire to capture Ralph becuase be was trying to find Ralph, which he did. Also the fire caused a ship to come to the idland because they saw the jungle on fire. With the ship stopping at the island and an officer coming on the beach, saved Ralph who was coming so close to a violent death. The officer also stopped the other boys from continuing on to kill Ralph. The ship saves Ralph and alll of the remaining boys. Seeing an adult and being saved, makes all of the boys emotional.
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It's so thickly coated with irony, Ralph's plan throughout the entire book is to keep a fire going to be rescued, Jack could care less. Also, Jack wanted to flush out the island with fire just to finish Ralph off, when instead it brings rescue to Ralph.
jack starts the fire to get ralph out of his hiding
Jack and his hunters set the forest on fire because they want to find Ralph find kill him. The rescuer sees the smoke and investigates the island. Ralph rushes out of the fiery forest and he sees the Naval Officer.
The irony is that Ralph has continually sought to remind the boys of the need to keep a signal fire lit in order to stand a chance of being rescued. At this point in the novel when Jack has given himself over completely to savagery and dismissed all thoughts of rescue from his mind. Jack's only intention in lighting the fire was to drive Ralph out of hiding with the intention of then killing him. That this murder motivated fire, lit by a person with no thought of rescue, should actual serve as the mechanism which rescues Ralph from Jack's intentions and indeed rescues all the remaining boys from the island and Jack's tyranny is without doubt ironic.
They were fighting with Roger, and Jack stole fire from Piggy and Ralph.