Bug: 3 possible behavioural bugs?

[Torin]

3) the problem is that if you attack an enemy army with 2 armies of yourself.
that enemy army might decide to attack one of yours.
So half of your army will attack and half will defend.
Theres a chance of this happening instead of both of your armies attack and enemy defends. Having the bigger army increases the chance that you push the enemy to defend despite of his orders to attack your province.