This article explores the competing constructions of shell shock in New Zealand during and after the Great War. It begins by considering the army’s construction of shell shock as a discipline problem, before going on to consider the medical profession’s attempts to place it within a somatic and then psychogenic paradigm. While shell shock was initially viewed as a psychogenic condition in New Zealand, within a few years of the end of the war it had become increasingly subject to medical understandings of the psychiatric profession, who dominated the treatment of the mentally ill.