Hi,
May I suggest that you try not placing the rest of your army under AI assistance. It is always much, much more fun if you command it yourself. You also have a higher chance of winning, when it comes to fighting - the AI is not as intelligent as a real human being such as yourself.

Sadly if you have your soilders under AI assistance then they very often ignore orders and follow the computer's, sometimes abnormal, orders instead. You have to take the unit away from AI assistance before they will listen properly.

You can also set the camera to follow the general during the battle. To do this go into options on the main menu - camera options and select General Camera.

I hope that you enjoy your battles. Good luck and cheers.