What does Ralph wish for that does come true in chapter 6?

After the meeting broke up at the end of chapter 5 Ralph, Simon and Piggy bemoaned the absence of adults on the island. Ralph said, and I quote... "I wish my father... O, what's the use?" A lttle later he also said, and I quote... "If only they could send a message to us," cried Ralph desperately. "If only they could send us something grown-up... a sign or something."