I accidently skip the deployment stage, so I deploy durring the battle.
Sparta has his Cohorts making a box with the Light Auxilia in the center. His archers are in lose formation infront of the box with his cav to the left flank.
In order to keep him from attacking my troops while they are still deploying, I attack his archers and cav. What happens durring this cavalry skirmish turns the tide of the rest of the battle.