There is a tension in military culture between the growing acceptance of moral injury and an idealized view of Stoicism that leaves little room for the guilt and shame, mercy and forgiveness characteristic of moral injury and repair. Does that emotion-lean view do justice to ancient Stoic doctrine? I argue that it does not. The emotions of the Stoic moral aspirant, such as shame and moral distress, bear striking similarities to the negative self-reactive attitudes that P.F. Strawson famously discusses. Notions of mercy and forgiveness speak to the positive reactive attitudes. I develop my argument by turning to Seneca’s essay, On Mercy and his play, the Trojan Woman. Mercy, Seneca insists, makes good on the gentler side of Stoicism. Learning from the mercy others show us, and that we would show them, is one way that soldiers can begin to show mercy towards themselves.