This chapter foregrounds practices of colonial warfare, focussing on the transimperial knowledge behind scorched earth and extermination. The first section identifies devastation and hunger war as the most common practice of colonial war, specifically colonial in the way it was racialised, applied ubiquitously and considered self-evident. In line with the book’s argument, it is argued that the contestation and final abandonment of the method by the Dutch in Aceh represent less of a national particularity than it might appear. The second section departs from conventional approaches to colonial genocide and explores how exterminatory practices were part of Western thought on colonial warfare. There were specific war contexts in which extermination became thinkable, even if these were not held to apply to the majority of colonial wars. Thus, somewhat paradoxically, extermination was an inherent and at the same time relatively minor presence in thinking on colonial war. Engaging with theories of German colonial particularity, the chapter applies these findings to the genocide in German South West Africa, showing how the actions and motivations standing behind it fit into broader transimperial patterns.