Im changing default formation following Darth Vader's turotials here http://forums.totalwar.org/vb/showth...g-Formation-AI ; http://forums.totalwar.org/vb/showth...ion-2%E2%80%9D
It is not so historical, but it is symmetric and understandable to the AI and armies attack each other in the center. With new formation enemy army stayed for a while on a place, shoot all arrows and then they attacked, before they just attacked. They focused center too much, but it was probably because they had a smaller formation. Still better as having them grouped on one side. https://imgur.com/a/lwSdH
code