As a piece of gossip and to show how hard Calvinus has been working on the game, I tell you that I just tried Plan Rupprecht again following some AI improvements Calvinus made, and oh boy.
If you remember the AAR, there was no decisive engagement between my Germans and the Swiss, the AI probably used them to create a safe frontline, not taking the overwhelming odds of facing the mighty German armies. That seemed like a reasonable course of action for me, since if you remember, I could barely enter France proper that way, terrain and all.
The current AI however, managed to mount a much harder resistance. The minor part of it was that a unit or two of the Swiss army were left behind to guard the border. They were swept away by my relentless charge, so no problem there.
The problem came from the fact that most of the remnants of the Swiss forces gathered in Bern. Now if you refer to my earlier screenshots you can see that I was in no position to leave that in enemy hands. Not only it is a crucial railroad area, it is als a home city of Switzerland so the army would stay supplied there, requiring a very big force to keep them in check (most units of the small Swiss force are mountain infantry, so they can be very effective on their home terrain).
As such, in August I had no alternative but to crush into them with my 3rd Army and force their retreat no matter the cost.
It was a bloody failure.
The combined defensive advantages of mountain, city, mountain experts, and good morale could not be overcome by my numbers and artillery support. In fact, what was left of my August munition supply was spent on Bern in the titanic struggle to achieve the breakthrough.
As a result, my 1st Army's battles to serve as the other wing of the encirclement had to be fought with no artillery support, and so they were also forced to retreat.
I made a second attempt with my depleted units in September, with similar luck. So by October, I still have not set foot on French soil!