Christian is correct
"Regarding speed, well I guess if the French player exploits his knowledge(or simply refuses to act as lame as Ney did) and goes directly without a stop to Quatre-Bras mostly ignoring the Prussians in the direction of Ligny there is not much one can do about it."
Remember there was some confusion and delay in the French initial movements due to the death of Berthier and Soult Chief of Staff and the issuer of Napoleon's orders. Also that turncoat that defected had a small delaying effect.
So hindsight being 20/20 Napoleon's plan is acknowledged by all to be magnificent. It caught the allies on the hope and it was just the execution that went astray. The Fog and Friction of war as its known.
The allies playing this have more knowledge of the plan than they accepted (Blutcher) or realised at the time (Wellington). Napoleon DID steal a march on them! So the allies have a fair chance to succeed knowing what they do now, they have options to either fall back in order to concentrate, with small delaying actions; or put up stout resistance early on in the hope of achieving major delays and loses to the French and concentrate for the final battle with all guns blazing. The Prussian guns are also very effective deployed correctly. So realistic options. The execution and player ability to counter the others moves will be the decider. Its not a forgone conclusion. The Allied forces combined ARE a very fine match for the French quality and command advantage.
I believe the campaign choices option with the large map is the best to try to change history without the initial French 'advantage' the allies seem not to be able to handle
![Drunk :frenchdrunk:](./images/smilies/icon_e_drunk.gif)