The Jementah Civil War happened in 1879 in Jementah, Sultanate of Johor when Tengku Alam Shah, the heir of Sultan Ali of Muar refused to give the district of Muar to the temporary administration of Sultan Abu Bakar of Johor (then Maharaja in 1879).
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The most notable event that happened as a result of the Johor government's victory in the Jementah Civil War was the opening of the town of Muar by Maharaja Abu Bakar.