Congestion and supply lines

[Liebchen]

No, I do not believe it has any effect. It probably should but the effect would be trivial as we would only be talking about a maximum drop of 1 point of supply level per congestion marker. Unless the supply could only to be traced through a path with included several congested hexes (which is highly unlikely) then the difference should not be noticeable.

"One supply point" seems awfully arbitrary.

For WWI, why couldn't it be 8 points, which is the cost for horse units to pass through brush, or even 15 (forest)?

For WWII it could cost 32 or 100 points, which is what it costs trucks to travel through brush or forest, respectively.