In the Civil War’s master narrative, the Shiloh and Corinth campaigns figure prominently because they represented more than just the Union’s large-scale military foray into the Confederacy’s vital western river region (specifically the region between the Cumberland and Mississippi rivers), the occupation of slave soil, and the Confederacy’s first major counteroffensive. They also exposed the complex interplay between armies and the places they operated, demonstrated how national objectives played out in local conditions, and revealed the war’s brutal nature. The Battle of Shiloh produced the bloodiest fighting on the North American continent up to that time, precipitated the subsequent Union capture of Corinth, Mississippi, disrupted slavery in the Trans-Mississippi, led to an enormous transfer of power in the western theater, and induced Union policy changes regarding occupation and repatriation of the Southern citizenry. In short, these developments established the foundation for the Union’s successful prosecution of the war.