oho, I was surprised how well you did as that was your first MP game, you will have no problems in future.
After you left, the 3rd Corps I asked you to pull back, came into action and were holding the French near those woods, if you had kept fighting with them earlier they might have been lost and the French could have broken right though to the western LOP, resulting in the battle being lost......pulling back a Corps to use again later is very important, but also hard to do, and (of course) you have to have fresh troops to take their place in the line.