The Dutch occupied the Siak area. As a result of the 1858 Siak Treaty. Where Sultan Ismail handed over Deli, Langkat, Asahan & Serdang areas to the Dutch, whereas those areas since Sultan Iskandar Muda, were under the control
of Aceh. The Dutch violated the Siak treaty, then the end of the London agreement in 1824.
The contents of the London agreement is the Netherlands & Great Britain to make provisions on the boundaries of power of the two areas in Southeast Asia with the latitude of Singapore. Both recognize the sovereignty of Aceh
Aceh accused the Dutch of failing to keep its promise, so that Dutch ships passing through Aceh waters were drowned out by the Aceh
forces. This Aceh act is supported by Britain. The opening of the Suez Canal by Ferdinand de Lesseps. Causing Aceh's waters to be very important for trade traffic.
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