Waterloo Campaign Rules

[General Sandman]

The concept sounds good to me. It looks like an improvement for any campaign.
So lets sought out the details.

We could have different chances to determine the success for a retreat after the afternoon/evening turn according the weather at the afternoon turn of the previous battle-phase and the next morning turn. Clear= lower chance > cloudy/rainy > higher chance.

Both turns = Weatherstorm > No retreat or higher mali and perhaps rallying phase of 2 turns (no movement or little MP in the 2nd turn).

[asalex]

LVdA uses night marching extra fatigue and has rules to convert fatigue in temporal and permanent casualties.

To keep things simple I would use the same mechanism as for pursuits, but instead of valuing the cavalry, using the weather and conditions of the retreat to calculate casualties/recovery percentage after the retreat.