2 Reasons they had to leave was 1. They were sold to cocasion/white owners and they had to leave, and 2. The cocasion slave owners felt that the a african americans didn't belong so they took them and beat them and stuff like that. (that is cruel man) Happy to Help! :D
They had more soldiers, they had more commanders, using the commanders advantage they usually flanked Lee for easy victories,
I think traditional cuz they do it based off of past generations
