He succeeded in taking Piggy's glasses to start a fire.
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Chief Jack House died in 1971.
Ralph is elected as the chief but Jack assumes the role of chief of the hunters.
They took Piggy´s glasses, but didn´t take the conch. The conch is only a symbol of authority and has power only when the society agrees that it does. For Jack, the shell is, now, only a shell. The glasses, however, give him real power because he is the only one with the ability to start a fire. "He was a chief now, in truth." (Pg. 168)
It seems that Roger has become the unofficial second in command to Jack and also chief torturer.
If you are referring to the book Lord of the Flies, then he became chief on page 181. Right after Piggy was killed.