Hi there,
Fortunately the AI on the battlefield in Europa Barbarorum is slightly superior to that of vanilla. It seems to manage it's forces much better due to EB's formations and it also now seems to try flanking moves much more frequently. It is not brilliantly improved, but it still is much more challenging.
Sadly Hard or Very Hard on the battlefield still does give the AI insane bonuses. I think, however, that this problem is hardcoded. The best way to avoid this is to play battles on Medium or Easy. In Medium the AI gets no bonuses and neither do you, but on the contrary, in Easy you get bonuses and the AI gets penalties.
Luckily EB does not effect your Barbarian invasion installation. All of your BI saves should survive your installation. Good luck and enjoy your campaign. Cheers.
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