During the Napoleonic Wars (1803–15), an unprecedented number of soldiers wrote “military memoirs,” firsthand accounts of the “first total war.” Next to private forms of recording experiences and keeping contact with those at home, such as letters or diaries, these memoirs were part of a larger shift in the relations between the army and civil society: soldiers wrote, at least partly, to change what non-combatants thought about them. As Britain did not see battles on home soil, war was both omnipresent and far away. Moreover, the reputation of the British armed forces was notorious, with common soldiers famously called “the scum of the earth” by Wellington. In conveying the battlefield experience to a sheltered audience, military memoirs, especially those written during or shortly after the wars, aimed at bridging the emotional divide between military and civil life, between the callous soldier and the compassionate citizen. Soldiers, too, these texts argued, were men of feeling, able to preserve a moral sense of respectability despite all the killing, blood, and trauma. Many memoirs communicated viscerally and in graphic detail about the horrors of war, both to make the traumatizing experience understandable and to show the heights of their emotional self-discipline. Bringing together the history of biography, reading, and emotions, this article argues that, by writing frankly about their horrific experiences, British soldiers fighting during the Napoleonic Wars contributed to changing civil society’s feeling rules about the army, reproaching the civilians’ contempt, and soliciting their compassion.