Ralph is able to persuade the other boys that they will be saved by sharing with them that his father is a navy captain. He tells them that the queen has a room with maps that show every island in the world.
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Ralph believes that his father, a naval officer, will rescue them. In the end, the group is rescued by a naval officer, but not by Ralph's father.
Ralph proposes that the group build a large signal fire on top of the island's central mountain, so that any passing ships might see the fire and know that someone is trapped on the island.
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."
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.
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.
Ralph wishes for a sign that they will be rescued. Unfortunately, the sign that they get is a dead pilot, who serves to become part of the "Beast," which ultimately causes them to become more and more savage.