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    The Java War or Diponegoro War was fought in central Java from 1825 to 1830, between the colonial Dutch Empire and native Javanese rebels. It started as a rebellion led by Prince Diponegoro, a leading member of the Javanese aristocracy who had previously cooperated with the Dutch.

    The proximate cause was the Dutch decision to build a road across a piece of Diponegoro's property that contained his parents' tomb.

    Amongst other causes was a sense of resentment felt by members of the Javanese aristocratic families at Dutch measures intended to restrict the renting out of land at high prices.

    The forces of Prince Diponegoro were successful in the early stages of the war, taking control of the middle of Java and besieging Yogyakarta. The Javanese population was supportive of Prince Diponegoro's cause, whereas the Dutch colonial authorities were initially indecisive. The Javanese peasantry had been adversely affected by the implementation of an exploitive cultivation system, which required villages to grow export crops to be sold to the government at fixed prices.

    As the Java war became prolonged, Prince Diponegoro had difficulties in maintaining the numbers of his troops. The Dutch colonial army, however, was able to fill its ranks with indigenous troops from Sulawesi, and later on with European reinforcements from the Netherlands itself. The Dutch commander, General de Kock, raised the siege of Yogyakarta on September 25th, 1825.

    Prince Diponegoro then began an extensive guerrilla war. It was not until 1827 that the Dutch armies were able to gain the upper hand through the deployment of mobile detachments of colonial troops, based in a number of small forts located throughout central Java. It is estimated that 200.000 died over the course of the conflict, 8.000 of them Dutch.

    The rebellion finally ended in 1830, after Prince Diponegoro was tricked into entering Dutch controlled territory near Magelang, believing he was there for negotiations for a possible cease- fire. He was captured and exiled to Manado and then to Makassar, where he died in 1855.

    Although the war had severely exhausted the Dutch finances, the pacification of Java enabled the colonial government of Dutch East Indies to implement Culturstelsel (“The Culture System") in Java, without any local opposition. Implemented in 1830 by the new governor general, Johannes van den Bosch, this cultivation system requires 20% of village land had to be devoted to government crops for export or, alternatively, peasants had to work in government-owned plantations for 60 days of the year. The policy brought the Dutch and their native allies' enormous wealth through the export of cash crops. It brought the Netherlands back from the brink of bankruptcy, and made the Dutch East Indies a self-sufficient and profitable colony.

What made the forces of Prince Diponegoro won the battle at the early stages?