On April 12, 1864, a force of more than 3,000 Confederate cavalry under Nathan Bedford Forrest galloped across West Tennessee to storm Fort Pillow on the Mississippi River, overwhelming a garrison of some 350 Southern white Unionists and over 300 former slaves turned artillerymen. By the next day, hundreds of Federals were dead or wounded, more than 60 black troops had been captured and reenslaved, and more than 100 white troops had been marched off...