The Aceh army was rapidly modernized, and Aceh soldiers butchered Köhler (a monument to this atrocity has been built inside Grand Mosque of Banda Aceh). 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.