I think this would be fun if it could be implemented.
First, there would need to be Fog of War as an option. I could place my armies inside the fog, to try to decieve my opponent. At the beginning of my turn, I could choose to make a sneak attack. This would mean that I would fortify before I attack instead of after. There would be a downside(or should I believe). To every roll of the ensuing battle, I would have a negative modifier applied. This could be something like -1 to the highest die or to all.
Please make any suggestions to better this, or let me know if you hate it;)