My understanding of WW1 was that rail lines were critical to supply and the massive size of the armies and supplies that they consumed.
I'm really frustrated because as the French I selected Plan XIX and drove through the Ardennes and cut off every rail line into Belgium. It has been this way for a year of turns and the German Armies in Belgium continue to fight as normal.
This is quite annoying. Furthermore, I have the setting that allows automatic supply in large cities turned to off.
Anybody got any idea as to why this is happening?