the fire on top of the mountain was out. Jack had taken the boys who were supposed to be keeping the fire alight away to hunt, meaning the fire was unattended and there was no smoke for a ship to see and hence the boys be rescued
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The fire is the boys' only hope of rescue from the island. When the boys go hunting and instead of minding the fire as Ralph instructed them to do, a ship passes by the island. Had the fire been lit, the people on the ship may have seen the signal and rescued the boys. This is why Ralph is angry; the other boys' disobediance ruined his chance of escaping the island.
The boys only had one plan for rescue, which was to keep a signal fire burning on the mountain top. Jack made the offer that his "hunters" would accept the responsibility of keeping the fire lit. Unfortunately, on the day that Ralph spotted a passing ship, Jack had decided that he need all of his hunters to effectively hunt a pig. As a result the fire was left untended and it went out. The ship passed by and the boys remained unrescued.
Ralph suggests a signal fire, which the boys light on the top of the mountain. The intention is to add green branches to produce smoke to attract the attention of any ship or plane which they might see.
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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