During the summer of 1863, Federal Forces scored major victories at Gettysburg and Vicksburg, turning the tide of war in favor of the Union. In southeastern Tennessee, U.S. troops focused their attention on the river and railroad center of Chattanooga, the gateway to the Confederate heartland. They took the town with little resistance, and complete victory in the region seemed imminent. The Confederate under Braxton Bragg struck back. At Chickamauga,...