You know about Gettysburg, Doc. Three days that changed the course of the struggle. Before it, Robert E Lee always fought from high ground strongholds, and teased the Union army to flail at them over and over from lesser positions. After staggering losses, the Union regularly retreated... until Gettysburg.
For the very first time, Robert E Lee did the flailing himself against obviously superior positions...and lost his army in his desperation. When you tour the battlefield and revisit the various struggles that took place over those three days, it will be obvious to you too. The terrain ruled and the Union owned it.
-The Round Tops
Straight ahead and faster -Bo Weaver 1970
"There I was..." -Griffin Niner Three Hotel
"One day closer to a parade..." Jonny Gomes, spring training 2013