It was 1862, the second year of the Civil War, though Kansans and Missourians had been fighting over slavery for almost a decade. For the 250 Union soldiers facing down rebel irregulars on Enoch Toothman's farm near Butler, Missouri, this was no battle over abstract principles. These were men of the First Kansas Colored Infantry, and they were fighting for their own freedom and that of their families. They belonged to the first black regiment...