The boys light the island on fire to drive Ralph out of the forest. Marines/army people see it and go to the shore where Ralph runs into one. He thinks they are crazy boys playing a game, but Ralph just breaks down and cries, along with the others. Crying for the innocence they lost on the island.
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The only plan that the boys have to increase their chances of rescue was the one suggested by Ralph, to build a fire on the mounatin top to attract the attention of any passing ships or planes.
The boys weren't rescued because the hunters were supposed to keep the fire going but they went hunting instead so the signal fire burned out.
in the beggining, yes. towards the end, their attitudes change
Jack volunteers his hunting group to watch.
Because they depend on Ralph to take care of them.
During the second asembly the littlun with the mulberry coloured birth mark on his face raised the subject of the snake-thing. Although the boys mocked the littlun many of them felt a distinct sense of unease. Ralph boosted their morale and raised their spirits by telling them that he'd decided that they wanted to have fun and they wanted to get rescued. This simple statement shifted the boys attention away from the idea of beasts in the dark jungle and focused them instead on positive thoughts. Ralph lifted the boys spirits further when he said, "We want to be rescued; and of course we shall be rescued."
Ralph insists that a signal fire must be made so that when his father comes to rescue them on a ship, the men on board will see the smoke and know where to find them. Also, burning things is fun.