I think you mean this:
ReallyBadAI Hardcore Submod
ReallyBadAI Hardcore is a totally new approach to battle complexity and provides more realistic and challenging gameplay.
Current features:
- comand chain: you can't issue attack orders for 30 seconds after doing so initially, 5 seconds grace period is granted for small adjustments,
- limited deployment time: typically you have 60 seconds for deployment before battle and additional 30 seconds with larger armies,
- player can't deploy stakes during sieges.
I will make a version without this feature.