In February 1862, after defeats at Bull Run and at Wilson's Creek in Missouri, the Union army was desperate for victory on the eve of its first offensive of the Civil War. The strategy was to penetrate the Southern heartland with support from a new "Brown Water"? navy. In a two-week campaign plagued by rising floodwaters and brutal winter weather, two armies collided in rural Tennessee to fight over two forts that controlled the Tennessee and Cumberland Rivers. Those intense days set the course of the war in the Western Theater for eighteen months and determined the fates of Ulysses S. Grant, Andrew H. Foote and Albert Sidney Johnston. Historian James R. Knight paints a picture of this crucial but often neglected and misunderstood turning point.