structural:scholar_edition
Aceh War

Pirates operating from Aceh threatened commerce in the Strait of Malacca; the sultan was unable to control them. Britain was a protector of Aceh and gave the Netherlands permission to eradicate the pirates. The campaign quickly drove out the sultan but the local leaders mobilized and fought the Dutch in four decades of guerrilla war, with high levels of atrocities. The Dutch colonial government declared war on Aceh on 26 March 1873. Aceh sought American help but Washington rejected the request.

The Dutch tried one strategy after another over the course of four decades. An expedition under Major General Johan Harmen Rudolf Köhler in 1873 occupied most of the coastal areas. Köhler's strategy was to attack and take the sultan's palace. It failed. The Dutch then tried a naval blockade, reconciliation, concentration within a line of forts, and lastly passive containment. They had scant success. Reaching 15 to 20 million guilders a year, the heavy spending for failed strategies nearly bankrupted the colonial government. During the course of the war, the Dutch set up the Gouvernment of Atjeh and Dependencies under a governor, although it did not establish wider control of its territory until after 1908.

The Aceh army was rapidly modernized, and Aceh soldiers killed Köhler. Köhler made some grave tactical errors and the reputation of the Dutch was severely harmed. In recent years, in line with expanding international attention to human rights issues and atrocities in war zones, there has been increasing discussion about some of the recorded acts of cruelty and slaughter committed by Dutch troops during the period of warfare in Aceh.

Hasan Mustafa (1852–1930) was a chief penghulu, or judge, for the colonial government and was stationed in Aceh. He had to balance traditional Muslim justice with Dutch law. To stop the Aceh rebellion, Hasan Mustafa issued a fatwa, telling the Muslim population there in 1894, "It is Incumbent upon the Indonesian Muslim to be loyal to the Dutch East Indies Government".