Use the following trick if you do not like the missions were you have to take control of all the men on the field. Place all your men in one group. If you have a group of men make as many groups as needed. Keep the person you want to control out of the groups. Turn all the tabs on the soldiers interface to the left (for example, "Free Move", "Open Fire", etc.). Take your men near the battle and select "Disband" (the button with four small triangles). Watch as your men become skillful soldiers.