With an increasing number of Australian military personnel being diagnosed with post-traumatic stress disorder, this collection of insightful essays examines the unseen wounds sustained by Australian personnel deployed to armed conflict, peacekeeping missions, humanitarian assistance and disaster relief for the first time. Top historians including Peter Stanley, Jeffrey Grey, Tom Frame, David Horner and Peter Rees examine the moral injury sustained by Australian personnel since 1990. Wile there are no easy answers or simple solutions, the contributors shed light on which existing approaches are misguided and the specific research, analysis and multi-disciplinary approaches needed to gain a better sense of moral injury, an unseen wound of Australia's military personnel.