Hard War, Soft Empire is the first scholarly biography in over thirty years of James Harrison Wilson-a Civil War general, Reconstruction administrator, and military governor in Cuba whose career illuminates how the United States developed and applied military power across domestic and global frontiers. Through Wilson's life, Mark C. Askew reinterprets the use of military strategy in the American Civil War and in US imperial contexts, highlighting how strategists used "strategic scripts" to navigate uncertainty and shape outcomes across conventional campaigns, occupation policy, and foreign governance. Wilson's campaigns in Alabama and Georgia not only contributed to the Union's final strategic blows but also introduced a model of military occupation that would later fail, foreshadowing many of the strategic challenges encountered elsewhere during Reconstruction. Askew's study situates Wilson among the central strategists who shaped events-militarily, socially, and politically-during and after the war.

Drawing from Wilson's personal papers, operational orders, government reports, and contemporary press, Askew explores how Wilson's strategic thinking evolved during key periods of US expansion. It connects Civil War battlefield choices with the longer arc of Reconstruction and empire, placing Wilson at the center of broader debates about race, governance, and the limits of American power. By analyzing how Wilson interpreted and adapted strategic frameworks, Askew's work contributes to conversations in Civil War, southern, and military-occupation history and adds to historiographies of military occupation, strategic thought, and the lived experience of US power projection across the nineteenth century.