The Netherlands invaded Aceh in 1873 after failing to obtain its submission by treaty, killing the sultan and taking the capital, but faced four decades of guerrilla resistance led by the ulama and territorial chiefs. From 1884 the Dutch withdrew to a fortified line around Kutaraja, then from 1898 the campaigns of J. B. van Heutsz and his adviser Christiaan Snouck Hurgronje returned to mobile columns that pursued resistance leaders, burned villages and attacked fortified settlements, including assaults on Kuta Reh and other highland villages in which whole communities including women and children were killed. Dutch military records themselves describe these operations, and Dutch historians have since debated whether the highland assaults, notably at Kuta Reh in 1904 where several hundred villagers including women and children were killed, amounted to massacres. Acehnese deaths across the war are usually put at 60,000-100,000 and Dutch and auxiliary deaths at around 37,000. The sultanate was abolished, Aceh incorporated into the Netherlands East Indies, and grievances from the war fed into later Acehnese resistance to both Dutch and Indonesian rule.
The Netherlands invaded and subjugated the Sultanate of Aceh over four decades of counter-guerrilla warfare
No census was taken before the conquest; Dutch colonial estimates of the 1870s put Aceh at roughly 500,000-800,000, and the first reliable count, the Netherlands Indies census of 1930, recorded about 1 million for the residency. The mid-point of the colonial range is used here and should be treated as approximate.
Both ends are estimates of Acehnese dead across four decades, derived from Dutch military reporting and later reconstructions; they include combatants and civilians and cannot be disaggregated. Dutch and colonial-army losses of roughly 37,000, mostly to disease, are separately recorded in Dutch military statistics.
Dutch military records and reporting on the Kuta Reh assault of 1904, together with later Dutch historical research, document village burning and the killing of non-combatants.
Indonesia