He is camouflaging himself so he can hunt without being seen
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I presume that you are referring to the start of chapter 3: Huts on the beach where Jack is alone in the forest. The answer is that Jack is trying to hunt pigs.
There is no attack by Jack's tribe on Ralph and his followers. Jack led a night-time raiding party, comprising of himself, Roger and Maurice, to steal Piggy's glasses in chapter 10: The Shell and the Glasses.
How to go about hunting the beast.
to kill the pig
At the end of chapter eleven samneric were taken by Jack and his tribe and forced to join Jack's tribe. In twelve they have to work with the tribe to try and find Ralph on the island. Nothing real serious happens to them. they don't get hurt of killed.