All great advice from everyone so far, playing a 5 turn scenario it might be difficult to put all that good advice into practise as these types of scenarios tend to be frantic and the result can often go one way or another with the odd disruption or lack of recovery from disruption altering the result one way or another.
As Rick says the 75's are key to any French success, I am playing a scenario at the moment and a major German attack by my opponent has foundered on the destruction well sighted 75's have spat out , but as has been stated wearing the CP player down is usually the most effective tactic.
One more point to add is that cavalry units should be always be assaulted by infantry without waiting to disrupt them, unless you get a very bad dice roll the result will always be favourable, even if you don't take the hex the fatigue suffered by the cavalry will be high and any losses are great on the VP table as cavalry losses earn you considerably more points than infantry.
I think you are going through a learning process here, if you get you head round playing the French in F14 and then decided to try the Russians in EP14 then you would again need to learn what makes them "tick".