[Imp]

With a campaign you need to know the battle type so you can guess what to change it to.
A map to large makes the attackers job easier as the defender is spread out to much and normally multiple avenues of approach.
Human however you can either lump your forces together or especially if V hex’s are clustered form aV Hex defence so you still have the advantage of overwhelming force.
I get it right around 1 game in 3 and the AI plays a lot better then.