Few concepts have become as closely associated with war literature as trauma. War literature revolves around the isolated voices of soldiers and their deeply unsettled afterlives – it takes as its subject matter the individual experience and consequences of war. This chapter argues, however, that the mass may be more than incidental in our understanding of how war literature embodies trauma. An overwhelming experience, trauma is deeply entangled with mass warfare, industrialisation, and the homogenous, empty time of global capitalism. The question of mass or scale is central to how we have come to conceptualise trauma more generally, whether in relation to genocide, pandemics, ecological limits to growth, or the political consequences of global finance or even mass trauma itself. Understood as a structural condition of anxiety, trauma is now even encroaching upon the future as a pre-traumatic foreboding of militarism and the threat of global catastrophe. Examining these links between war and the mass, this chapter suggests a reconceptualization of trauma that associates its characteristic temporal dislocations with questions of scale, uniformity, and incomprehension.