11.  In New Orleans, Nicholas says, several all- black regiments were formed to fight for the South and then joined the Union forces when the city fell.

12.  Lee wanted to concentrate the troops and defeat the main Union force.

13.  The battle proved to be a decisive victory for Union forces as they were able to continue on and capture the Confederate railroad system in nearby Corinth, Miss.

14.  The Confederates prevailed with no casualties, and with Union forces in retreat.

15.  The raiders torched the hay but raced off before the larger Union force could react.

16.  The Union forces built a network of trenches that are still visible.

17.  The Union forces were defeated and retreated to Chattanooga, where they were beseiged for almost two months.

18.  Two years earlier, Lincoln had appointed Johnson as military governor of Tennessee, which had been reclaimed by union forces.

19.  Union forces had already blockaded the Atlantic Ocean and other waterways.

20.  Union forces rushed in, but when Confederates noticed the Union soldiers were trapped, they mounted a counterattack.