They took Piggy's glasses, and fire from Ralph's camp.
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Jack and two of his tribe (Roger and Maurice) raid Ralph's shelter and steal Piggy's glasses. They do this because they have nothing to light their own fires with and also as an act of power, a deliberate provocation.
They have spears
hubba hubaba
Because in the end of the chapter, Jack's tribe attacks Ralphs tribe. Piggy thought they were after the conch (The Shell) but instead, they stole Piggy's glasses for fire usage (The Glasses)
Jack and his tribe make their headquarters at the Castle Rock.