Caesar in Gaul is broken.
I'm having the same bug as this person even though it's a year after this post.
https://www.twcenter.net/forums/show...caesar+in+gaul
I don't have submods at all or any other mods besides DeI.
The amount the movement is reduced is far more than any seasonal or supply effect.
And my other armies can't move at all.
Only Caesar is able to inch wom slowly over the map, making the campaign unplayable.