I have not played almost at all for like 6 months or so and I started playing again recently. I choose the adaptive combat terrain bonus early in the game because that +1 combat bonus should really help if I try to have to fight in the farmlands like my capitol is in. I capture a fort or build one and let the enemy army march into it and begin its siege. My army then marches back in. Normally this triggered a defensive battle for the person who controlled the fort back when I played (it was a recent change back then). Now days it still seems to still however if I have adaptive combat terrain and the fort is in the correct land type I am getting a penalty. So now I am confused. Is there something I am missing? I read as many patch notes as I could find but there seems to be no explanation for it anywhere. This penalty should be a bonus I thought?