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In page Indonesian National Revolution:

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At midnight on 20 July 1947, the Dutch launched a major military offensive called Operatie Product, with the aim of regaining control of economically lucrative areas in Java and Sumatra and deep ports in Java, thus covering the cost of the ~120,000-strong Dutch military presence.[1][2] Claiming violations of the Linggajati Agreement, the Dutch euphemistically described the campaign as "police actions" to restore law and order. In the offensive, Dutch forces drove Republican troops out of parts of Sumatra, and East and West Java. The Republicans were confined to the Yogyakarta region of Java.[citation needed]