Originally Posted by
Christonikos
For the first issue, if.you want to play against same era armies, when you press the battle button and the window tha says 1v1, auto-team land, naval, siege battle pops up, there is a box on the down left corner that writes 'Allow mixed avatars' Untick it.
As.for the campaign part, first try disabling any mods you have and then try verifying Game Cachee through steam properties. I hope you are trying to play MP campa8gn with a friend of yours cause y9u ll need a lot of patience till you manage to get thi gs started