I did not think this was possible until I read the feedback from ACW Round Robin. Here is the P.O.D. Escaped slaves bring word of the approaching Confederate forces to Grants forces at Pittsburgh Landing. Losing the element of surprise, the Confederate forces at the Battle Of Shiloh suffered a devastating defeat. There few forces available to oppose Grant as he marched to Cornith and forced the town to surrender on April 16, 1862. Grant drive through Mississippi progressed steadily, he. and the troops that had marched down from Memphis, began encircling Vicksburg in late August. On October, 12 1862, the last Confederate stronghold on the Mississippi surrendered. ( Columbus Day was never celebrated there again until it was made a Monday holiday in 1971.) After Grant´s victory at Chattanooga On May 20. 1863, Lincoln promoted him to General in Chief. He assumed this new command in early June, his opposing general Robert E. Lee was wrapping up final preparation for an invasion of the North, meant to divert Union forces from the invasion of Georgia. So when that battle happens in rural Pennsylvania, Grant is giving the orders. So what changes?