This article develops the idea that late modern war’s relationship with the geos (the ground and the life it sustains) is doubly destructive. While part of this is recognized in a recent focus on slow violence and ecological aftermaths, there is little consideration of the ‘beforemath’, or the sites of extraction that make advanced military technologies possible. Drawing attention to mining in the Democratic Republic of the Congo (DRC), the article connects military technologies to arms manufacturers and their use of extracted minerals (e.g. cobalt, tantalum, copper, uranium). Shared patterns of environmental and public health effects across parts of Iraq, Gaza and the DRC indicate the doubly destructive nature of late modern war’s relationship with the geos: toxic materials threaten life after war as the deposits of bombardment and before war as mineral commodities at the beginning of arms supply chains. The article explicates how a perspective from the beforemath radically refigures the ways we think about war and spatiality, temporality, and the range of bodies affected in ways that promise a fuller understanding of the violence distributed by practices of late modern war.